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Fertilising Commercial Forest Species in Southern Africa: Research Progress and Problems (Part 1)
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.A. Herbert --- , South Africa A. P.G. Schönau --- , South AfricaSince the inception of forest fertiliser research in Southern Africa in 1926, eight eucalypt, six pine and four acacia species have been tested, encompassing a wide range of sites in summer, winter and uniform rainfall areas. Marked deficiencies of P,... -
Litterfall and Nutrient Release in Mature Pinus radiata in the South-western Cape
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D.B. Versfeld --- Division of Forest Science and Technology, CSIR, Jonkershoek F.R.C., D. G.M. Donald --- Faculty of Forestry,Fast-growing plantations of conifers have replaced areas of mediterranean shrubland in the south-western Cape. This study arises from the need to quantify the impacts of major changes in primary productivity, litterfall, and nutrient cycling in terms of the site utilisation... -
Productivity of Eucalyptus regnans Forest Regenerating after Bushfire
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Peter Attiwill --- , AustraliaA natural forest of mountain ash was clearfelled in 1983 and burned by bushfire immediately after logging. The resulting natural regeneration has high productivity, with a mean volume increment close to 50 m3/ha per year, mean rate of biomass accumulation... -
Regeneration Procedures of Pinus radiata in the Southern Cape Province
Item type: Journal Article • Journal: South African Forestry Journal • Authors: J.B. Zwolinski --- , USA D. G.M. Donald --- Forestry Faculty, A. van Laar --- Forestry Faculty,Part 2 of the series of papers dealing with the regeneration ofPinus radiata in the Southern Cape discusses the effect of the experimental treatments on the distribution of nutrient elements, more particularly to estimate the impact of treatments on changes... -
The influence of an Acacia karroo tree on grass production in its vicinity
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.C. Stuart‐Hill --- Department of Agriculture and Water Supply (East Cape Region), N.N. Tainton --- Department of Agriculture and Water Supply (East Cape Region), H.J. Barnard --- Department of Agriculture and Water Supply (East Cape Region),The investigation was concerned with the impact of an Acacia karroo tree on the productivity of the surrounding herbaceous layer. -
Genotypic tolerance of selected dry bean (Phaseolus vulgaris L.) cultivar s to soluble Al and to acid, low P soil conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.D. Noble --- Department of Crop Science, J.D. Lea --- Department of Crop Science, M.V. Fey --- Department of Soil Science and Agrometeorology,Twelve dry bean cultivare were grown for seven days on filter paper soaked with nutrient solution containing a range of up to 10 mmol Al dm−3. Differential response to Al toxicity, measured as taproot elongation, occurred at Al concentrations of... -
Aluminium toxicity and induced nutrient disorders involving the uptake and transport of P, K, Ca and Mg in Zea mays L.
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- Department of Agriculture, C.M. Breen --- Department of Botany, M.V. Fey --- Department of Soil Science and Agrometeorology,Chemical analysis of plant fractions of maize cultivars TX 24 and HL 1 grown in liquid culture containing Al showed that the action of Al was directed at the uptake of Ca and Mg and the transport of P and... -
Rol van tekorte aan sekere makro-elemente by verdraagsaamheid van mielies (Zea mays L.) teenoor atrasien
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. Reinhardt --- Departement Plantproduksie, P.C. Nel --- Departement Plantproduksie, N. M.J. Vermeulen --- Departement Biochemie, Z. Apostolides --- Departement Biochemie, D. J.J. Potgieter --- Departement Biochemie,Die verdraagsaamheid van mieliesaailinge (Zea mays L. kv SSM2041) teenoor atrasien is in 'n glashuis ondersoek. Plante is in potte gekweek, in voedingsoplossings met tekorte aan sekere makro-elemente. Atrasien in die voedingsoplossings is periodiek bepaal met behulp van hoëdrukvloeistofchromatografie. Tekorte... -
Seasonal uptake of phosphorus, potassium, calcium and magnesium by young peach trees
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. J.C. Stassen --- Department of Agronomy and Horticulture, Republic of South Africa J.D. Stadler --- , Republic of South AfricaTwo-year-old peach trees, grown in sand culture were destructively sampled over a period of 14 months, to determine the uptake of phosphorus, potassium, calcium and magnesium in the new growth (leaves, fruit and new shoots) and in the permanent structure... -
Die invloed van voedingsoplossingkonsentrasie op groei van growweskilsuurlemoen en Troyer citrange saailinge
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. G.K. Coetzee --- Outspan Laboratoriums, Republiek van Suid-Afrika L.C. Holtzhausen --- Departement Tuinboukunde, Republiek van Suid-Afrika R.O. Barnard --- Departement Grondkunde en Plantvoeding, Republiek van Suid-AfrikaIn sitruskwekerye word vegetatiewe groei gestimuleer deur die konsentrasie van voedingstowwe in die groeimedium so hoog moontlik te handhaaf. Dit kan egter te hoë konsentrasie teweegbring. In die ondersoek is gevind dat growwe- skilsuurlemoensaailinge (GS) optimaal groei waar sproeibemes was... -
Aluminium and pH effects on dry bean root growth in nutrient solution
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.D. Noble --- Department of Agronomy, Republic of South Africa T. Harding --- Department of Agronomy, Republic of South AfricaDespite considerable interest in the phytotoxic nature of soluble aluminium (Al), the relationships between Al species and observed phytotoxicity are not fully understood. A solution culture technique was employed to study the effects of Al species, at varying pH levels,... -
Seasonal uptake and distribution of nutrient elements by kiwifruit vines 1. Macronutrients
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.G. Kotzé --- , Republic of South Africa Johanna de Villiers --- , Republic of South AfricaDry matter production and uptake and distribution of macronutrients in kiwifruit vines (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa) cv. Hayward were studied in sand culture. The total dry mass of the kiwifruit vine increased sharply... -
Seasonal uptake and distribution of nutrient elements by kiwifruit vines 2. Micronutrients
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.G. Kotzé --- , Republic of South Africa Johanna de Villiers --- , Republic of South AfricaUptake and distribution of micronutrients by kiwifruit vines (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa) cv. Hayward were studied in sand culture. The period of rapid accumulation of different micronutrients differed substantially. Zinc was accumulated mainly... -
The volatilization of formulated ester, amine and K salt derivatives of phenoxyalkanoic herbicides: Evidence to connect herbicide activity with plant nutrient status of tomato (Lycopersicon esculentum Mill) plants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- Department of Agriculture and Water Supply, Republic of South AfricaControlled environment studies were conducted involving different vapour treatments applied to tomato plants using the herbicides 2,4-D iso-octyl ester/ioxynil, 2,4-D dimethyl amine salt and MCPA K salt. These indicated that the amine salt and MCPA were much less volatile than... -
Lime-phosphorus interactions in the growth of temperate pasture species on highly-weathered soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. Miles --- Department of Agricultural Development, Republic of South Africa R.J. Eckard --- Department of Agricultural Development, Republic of South AfricaLime and phosphorus (P) requirements for the growth of temperate pasture species on acid, well-drained soils in the Natal Midlands were evaluated in factorial field trials. Species studied were white clover (Trifolium repens), tall fescue (Festuca arundinacea) and Italian ryegrass... -
Nutrient inflow to the roots of irrigated wheat throughout the growing season under semi-arid climatic conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.C. du Preez --- Department of Soil Science, Republic of South Africa A. T.P. Bennie --- Department of Soil Science, Republic of South AfricaThe objective of this study was to obtain information on the inflow of N, P, K, Ca, Mg, S, Cu, Fe, Mn and Zn to the roots of wheat (Triticum aestivum L.) grown under normal irrigation farming conditions. Except for... -
The possible use of agar gel in plant nutritional studies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Bornman --- , Republic of South Africa R.O. Barnard --- Department of Soil Science and Plant Nutrition, Republic of South AfricaNutrition-element elimination studies on crops in soil with a high fixation capacity using pot experiments are usually problematic where the realistic and accurate application of nutrients is concerned. The possible use of agar gel in plant nutritional studies was investigated... -
Comparative patterns of sodium accumulation in leaves of selected savanna species growing on sodic and nonsodic soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CatherineL. Bailey --- Botany Department, South Africa MaryC. Scholes --- Botany Department, South AfricaPlants show differing mechanisms of tolerance to high sodium levels in soils. Physiological and biochemical mechanisms have been investigated for many crop species but little information is available for indigenous tree and grass species. Foliar concentrations of sodium, calcium, potassium,... -
Organic matter, pH and nutrient distribution in soil layers of a savanna Thornveld subjected to different burning frequencies at Alice in the Eastern Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.A. Materechera --- Facility of Agriculture, Republic of South Africa O.T. Mandiringana --- Department of Agronomy, Republic of South Africa P.M. Mbokodi --- Department of Agronomy, Republic of South Africa K. Nyamapfene --- , Republic of South AfricaFire is an important tool for the management of grazed savanna grasslands in the Eastern Cape, South Africa. The aim of this study was to quantify the influence of veld burning frequency on soil properties especially organic matter, pH, exchangeable... -
An investigation into the problems associated with revegetating chrysotile tailings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. van Rensburg --- , Republic of South Africa L. Pistoruis --- , Republic of South AfricaThe present investigation was initiated because of the limited success achieved in the past at attempts to revegetate chrysotile tailings with their associated inherent environmental risk factors. The current set of experiments and surveys, as with several previous studies, were... -
Production and physico-chemical properties of surface casts from microchaetid earthworms in central Eastern Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.A. Materechera --- Faculty of Agriculture, Republic of South Africa O.T. Mandiringana --- Agronomy Department, Republic of South Africa K. Nyamapfene --- , Republic of South AfricaThe study was undertaken to estimate surface cast production by microchaetid earthworms and to compare the physical and chemical properties of the casts with the surrounding non-cast soil. An average of 104 (range 64–132) and 192 (range 182–222) t ha−1... -
Sucrose synthesis and translocation in Zea mays L. during early growth, when subjected to N and K deficiency
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Pretorius --- Department of Agronomy and Horticulture, Republic of South Africa D.T. Nieuwoudt --- Department of Agronomy and Horticulture, Republic of South Africa Diana Eksteen --- Department of Agronomy and Horticulture, Republic of South AfricaBy omitting N and K either separately or in combination from the rooting medium, a nutrient stress condition was created with the aim of ascertaining whether sucrose synthesis or its translocation was linked to nutrient availability (N, K) in young... -
Effects of nutrient regime on bulb yield and plant quality of Lachenalia Jacq. (Hyacinthaceae)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. Roodbol --- , South Africa E. Louw --- , South Africa J.G. Niederwieser --- , South AfricaThe effects of different nutrient regimes on the Lachenalia cvs ‘Romelia’ and ‘Namakwa’ were studied over two successive seasons. The basic formulation of the Commisie Glastuinbouw (1992), viz 0.37 g KNO3 + 0.36 g Ca(NO3)2 + 0.06 g MgS04 +... -
Effects of nutrient supply on nutrient element content of two lachenalia cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. Roodbol --- , Republic of South Africa J.G. Niederwieser --- , Republic of South AfricaThe N, K, Ca, P and Mg content (% dry mass) of bulbs and leaves of two lachenalia cultivars, Romelia and Namakwa, was determined at different application levels of a basic nutrient formulation to develop norms for tissue analysis and... -
Temporal and spatial relations of plant element uptake and yield of a lucerne stand
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Venter --- Department of Plant Production and Soil Science, South Africa D.J. Beukes --- , South Africa A.S. Claassens --- Department of Plant Production and Soil Science, South Africa M. Van Meirvenne --- Dept. Soil Management and Soil Care, BelgiumIn general, agricultural fields are managed as uniform units, ignoring spatial and temporal relations between plant element uptake and yield. This study was conducted from June 2001 to February 2002 on a two-year-old lucerne stand and explores the spatial relationships... -
Depletion of nutrients in adjacent crop lands by Eucalyptus camaldulensis
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jiregna Gindaba --- Department of Horticultural Science, South Africa Andrey Rozanov --- Department of Soil Science, South Africa Legesse Negash --- Department of Biology, EthiopiaFine root distribution of Eucalyptus camaldulensis Dehnh and effects on soil fertility attributes were studied under field conditions in Badessa, Eastern Ethiopia. Soil samples were collected from inside the stand, edge of the stand and 10 m away from the... -
Variability among barley landraces in response to waterlogging stress in the greenhouse
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Assefa --- Sheno Research Center, Ethiopia M.T. Labuschagne --- Department of Plant Sciences, South AfricaBarley production, in some parts of the Ethiopian central highlands, is constrained by seasonal waterlogging. The aim of this study was to investigate differences in growth, nutrient uptake and concentration under waterlogging stress between landraces varying in tolerance. A three... -
Response of Lachenalia growing in soil to nitrogen fertilization during the nursery phase
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.M. Engelbrecht --- Department of Soil, South Africa C.C. du Preez --- Department of Soil, South Africa J.J. Spies --- Departement of Plant Sciences, South AfricaDuring the nursery phase, Lachenalia flower bulb producers plant bulblets propagated from leaf cuttings, for enlargement. They strive for a high yield of good quality bulbs that are of a marketable size within a year. In this regard nitrogen is... -
Influence of long-term wheat residue management on acidity and some macronutrients in an Avalon soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E. Kotzé --- Department of Soil, Crop and Climate Sciences, 9300 Republic of South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, 9300 Republic of South AfricaThis study was initiated to determine the influence of different wheat residue management practices, that were sustained for about 20 years, on some fertility indicators of an Avalon soil in a long-term trial near Bethlehem in the eastern Free State... -
Relationships between plant and soil nutrient status and position in the landscape on Pellic Vertisols of Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lemma Gizachew --- , Ethiopia G.N. Smit --- Department of Animal, Wildlife and Grassland Sciences, South AfricaEffects of land use on soil nutrients and related soil parameters of Pellic Vertisols were assessed using soil samples collected from plots subjected to the cultivation of tef (Eragrostis tef) (TF) and grass pea (Lathyrus sativus) (GP) and native grassland... -
Nitrogen fixation and biomass productivity of indigenous legumes for fertility restoration of abandoned soils in smallholder farming systems
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H. Nezomba --- , Zimbabwe T. P Tauro --- , Zimbabwe F. Mtambanengwe --- , Zimbabwe P. Mapfumo --- , ZimbabweMost legume-based soil fertility technologies often fail to make the desired impact on nutrient-depleted soils partly due to low N2-fixation rates and poor biomass productivity. A study was conducted in the 2004/05 and 2005/06 rainfall seasons to evaluate biomass productivity... -
The effects of a water treatment residue on grain yield and nutrient content in seeds of common dry beans (Phaseolus vulgaris L. cv. Ghadra) grown in a dystrophic soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.W. Titshall --- , South Africa J.C. Hughes --- , South AfricaThis glasshouse study investigated the grain yield and nutrient content of seed of common dry beans (Phaseolus vulgaris L. cv. Ghadra) grown in a dystrophic sandy soil treated with 0, 50, 100, 200 and 400 g kg−1 water treatment residue... -
Response of Lachenalia growing in soil to interactions between nitrogen and phosphorus fertilisation in the nursery phase
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.M. Engelbrecht --- Department of Soil, South Africa C.C. du Preez --- Department of Soil, South Africa J.J. Spies --- Department of Plant Sciences, South AfricaThe interactions between nutrients required by plants play an important role in sustainable crop production. Both nitrogen and phosphorus are involved in a number of important functions in the plant such as carbohydrate and protein formation. The need to investigate... -
Macro and micro element requirements of young and bearing apple trees under drip fertigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Grace N. Kangueehi --- Department of Horticultural Science, South Africa P.J.C. Stassen --- , South Africa K.I. Theron --- Department of Horticultural Science, South Africa J. Wooldridge --- , South Africa‘Brookfield Gala’ apple trees on Merton 793 rootstock were planted on a loam sand soil at 2000 trees ha−1, trained to a central leader using the solaxe system and supplied with nutrients by drip fertigation. Trees were individually excavated at... -
Effects of liming and inorganic fertiliser application on soil properties and maize growth and yield in rural agriculture in the Mbizana area, Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: DJ Beukes --- , South Africa TC Mapumulo --- , South Africa TP Fyfield --- , South Africa GG Jezile --- , South AfricaA five-year study was conducted to assess the seasonal and medium-term effects of liming and fertilisation of an acid clay loam topsoil on soil properties and on the growth and yield of maize under dry land. Treatments consisted of a... -
Comparison of medium-term organic and inorganic fertiliser application on leaf nutrient concentration and yield of maize in rural agriculture in the Mbizana area, Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: DJ Beukes --- , South Africa TP Fyfield --- , South Africa GG Jezile --- , South Africa TC Mapumulo --- , South AfricaA five-year study was conducted in the Mbizana area, Eastern Cape province, to assess the seasonal and medium term effects of chicken manure and inorganic fertiliser application to an acid clay loam topsoil on nutrient element uptake and yield of... -
THE LIMNOLOGY OF SOME SOUTH AFRICAN IMPOUNDMENTS I. THE PHYSICO-CHEMICAL LIMNOLOGY OF HARTBEESPOORT DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W.E. Scott --- , South Africa M.T. Seaman --- , South Africa A.D. Connell --- , South Africa S.I. Kohlmeyer --- , South Africa D.F. Toerien --- , South AfricaHartbeespoort Dam is a eutrophic, warm monomictic lake with overturn occurring in April. The lake is stratified for about six months of the year and in late summer the stratification appears stable. Light penetration in the dam depends both on... -
AN INTRODUCTION TO THE LIMNOLOGY OF ROODEPLAAT DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , South Africa D.F. Toerien --- , South Africa D.J. Steÿn --- , South AfricaA two-year limnological survey between 1973 and 1975 showed that the Roodeplaat Dam is a warm monomictic impoundment which has stable thermal stratification during summer. Oxygen supersaturation of the surface waters and anaerobic conditions in the hypolimnion were encountered during... -
SOME ASPECTS OF THE DISTRIBUTION OF REACTIVE PHOSPHORUS IN LAKE McILWAINE, RHODESIA: PHOSPHORUS LOADING AND SEASONAL RESPONSES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Thornton --- Hydrobiology Research Unit,Between November 1976 and September 1977, samples were taken on a fortnightly basis from a representative station in Lake McIlwaine. In addition an intensive study of the riverine input of reactive phosphorus was conducted. Samples were analysed for total reactive... -
HYDROCHEMISTRY OF THE UPPER ORANGE RIVER CATCHMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: PC Keulder --- Department of Botany, South AfricaA four year pre-impoundment study of the catchment of the Hendrik Verwoerd Dam was conducted. The Orange River was the major source of dissolved chemicals and suspended sediments, while the Caledon River contributed 24 and 30% respectively, and the Kraai... -
QUALITY AND NUTRIENT RELEASE OF POULTRY MANURE IMMERSED IN WATER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.V. Msiska --- Ministry of Forestry and Natural Resources, Fisheries Department, MalawiAttempts aimed at establishing a sound basis for the frequency of manure inputs into fish pond water showed that the greater bulk of mineral release occurs within 72 hours of immersion into water. Elemental composition of the poultry manure revealed... -
DISSOLVED OXYGEN DEPLETION AND NUTRIENT UPTAKE IN AN IMPOUNDMENT INFESTED WITH EICHHORNIA CRASSIPES (MART.) SOLMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.N. Shillinglaw --- Department of Water Affairs, South AfricaBon Accord Dam, near Pretoria, had 95% of its surface area covered by water hyacinth (Eichhornia crassipes (Mart) Solms). The mean surface dissolved oxygen concentration was 1,9 mg O2 2−1 which is below the minimum concentration required by most angling... -
UNEXPECTED GROWTH OF PISTIA STRATIOTES IN SANYATI GORGE, LAKE KARIBA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.F. du Toit --- University Lake Kariba Research Station, ZimbabweDuring early 1984, the floating plant Pistia stratiotes grew unexpectedly and very rapidly in the Sanyati Gorge of Lake Kariba. Measurements of phosphorus and nitrogen in the surface waters revealed a pattern of nutrient concentrations along the gorge that could... -
NUTRIENTS IN AQUATIC ECOSYSTEMS: AN INTRODUCTION TO SIMILARITIES BETWEEN FRESHWATER AND MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P Chapman --- , South Africa JA Thornton --- , South Africa -
NUTRIENTS IN AFRICAN LAKE ECOSYSTEMS: DO WE KNOW ALL?
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Thornton --- , South AfricaIt is nearly sixty years since the first studies were undertaken on the nutrient chemistry of African lakes. There have been numerous studies on the chemical composition of African waters in the intervening years. Yet as recently as five years... -
NUTRIENT CYCLING IN MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P. Chapman --- , South AfricaThe overall cycles of nitrogen, phosphorus and silicon in the sea are described and compared. Data on the fluxes and rates of change between various pools of each nutrient are given, where available, and gaps in knowledge are pointed out... -
NUTRIENTS AND THE PRODUCTIVITY OF ESTUARINE AND COASTAL MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.W. Nixon --- Marine Ecosystems Research Laboratory, United States of America C.A. Oviatt --- Marine Ecosystems Research Laboratory, United States of America J. Frithsen --- Marine Ecosystems Research Laboratory, United States of America B. Sullivan --- Marine Ecosystems Research Laboratory, United States of AmericaRecent research on estuarine and coastal marine systems has revealed two particularly interesting things about nutrients and productivity. First is the observation that these areas are among the most intensively fertilized environments on earth. Second is the common finding that... -
ZOOPLANKTON AND ESTUARINE RELICT (BENTHIC) FAUNA IN LAKE MZINGAZI, A FRESHWATER COASTAL LAKE OF NATAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.K. Fowles --- , South Africa C. G.M. Archibald --- , South AfricaLake Mzingazi, a natural, undisturbed freshwater coastal lake in the heart of the Richards Bay municipal area, is threatened by rapid urban and industrial growth. The previously unrecorded composition and distribution of zooplankton in the lake was studied during 1979... -
FUTURE CHALLENGES IN WATER QUALITY MODELLING WITH PARTICULAR REFERENCE TO OPERATIONALLY CLOSED CATCHMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.F. Forster --- Department of Water Affairs, South Africa F.A. Stoffberg --- Department of Water Affairs, South Africa J.A. van Rooyen --- Department of Water Affairs, South AfricaAs a result of the declining quality of many water sources, the use of water quality models in planning is increasing. To date applications have involved the simulation of total dissolved salts and nutrients, largely in catchments affected by urban... -
ECOLOGICAL PROBLEMS IN HARTBEESPOORT DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: AndrewC. Jarvis --- National Institute for Water Research,In Hartbeespoort Dam ecological problems arise primarily as a consequence of the reservoir's hypertrophic condition. The development of anaerobic conditions, high primary productivity and blue-green algal dominance have many detrimental influences on ecosystem structure and function. With high rates of... -
FLUX OF INORGANIC NUTRIENTS AND PARTICULATE CARBON BETWEEN A SPARTINA MARITIMA SALT MARSH AND THE SWARTKOPS ESTUARY, EASTERN CAPE
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. Baird --- Department of Zoology, South Africa P. E.D. Winter --- Department of Zoology, South AfricaThe flux of dissolved inorganic nutrients (NH4-N, NO2-N, NO3-N, SRP) and suspended particulates (particulate organic carbon POC, and particulate inorganic carbon PIC) was measured across the mouth of a small creek draining a portion of the intertidal Spartina salt marsh... -
FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B.R. Allanson --- , South Africa G. H.L. Read --- , South AfricaRiver flow patterns in the Kariega, Great Fish and Keiskamma estuaries, South Africa are examined to assess the impact variation in flow has upon the delivery of inorganic nutrients, total organic carbon, primary productivity and the heterotrophic components, bacteria and... -
Defining function in rangelands of the Peddie district, Eastern Cape, using Landscape Function Analysis
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AR Palmer FJ Killer AM Avis D TongwayPortions of natural rangeland in the Great Fish River Valley have been defined as degraded by several studies using vegetation analysis techniques. It was considered desirable that soil surface condition should also be described to provide an index of landscape... -
Production and decomposition of plant litter in an arid rangeland of Kenya
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: WN Ekaya JI KinyamarioData on litter production and decomposition in an arid rangeland in Kenya was collected over a two-year period. Utter sampling was carried out at monthly intervals using a rectangular 0.25m−2 quadrat frame. Utter within the quadrats was handpicked and washed... -
Ecological effects of fire-breaks in the montane grasslands of the southern Drakensberg, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TG O'Connor RG Uys AJ MillsFire-breaks, by legislation, are burnt annually before mid-winter in the southern Drakensberg, affecting 5–10% of the landscape, and resulting in marked selection for the early season flush by both livestock and wildlife. This study investigated whether this severe defoliation regime... -
Feeding characteristics of sheep (Ovis aries) and Grant's gazelles (Gazella granti) on Kapiti ranch, Kenya
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JM Kilonzo WN Ekaya RN KinuthiaA study was conducted to determine the dietary characteristics of sheep and Grant's gazelles on Kapiti Ranch, Kenya. The botanical composition of the diet was determined using the faecal microhistological technique. Plant species in the diets were categorised into grass,... -
The distribution of sweetveld and sourveld in South Africa's grassland biome in relation to environmental factors
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: W.N. Ellery --- Department of Geographical and Environmental Sciences, Republic of South Africa R.J. Scholes --- CSIR, Republic of South Africa M.C. Scholes --- Centre for African Ecology, Department of Botany, Republic of South AfricaThe distribution of sweet‐ and sourveld in relation to climate, parent material and soil nutrients has been examined in South Africa's grassland biome. Sourveld occurs in areas with high water supply and where parent material gives rise to soils with... -
Patchiness in semi‐arid dwarf shrublands: Evidence from satellite‐derived indices for elevated CO2 assimilation rates on a geochemical mound in the Karoo National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A.R. Palmer --- , South Africa F. van der Heyden --- , South AfricaSatellite‐derived vegetation indices were used to identify a geochemical mound of higher active greenness in the Karoo National Park, Beaufort West, South Africa. We determined whether this mound was occupied by plants with higher CO2 assimilation rate. Plant cover on... -
Modification of soil nutrients and micro‐climate by tree crowns in a semi‐arid rangeland of south‐western Zimbabwe
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C.S. Moyo --- , Zimbabwe P.G.H. Frost --- Institute of Environmental Studies, Zimbabwe B.M. Campbell --- Institute of Environmental Studies, ZimbabweTree crowns in semi‐arid areas have often been found to create micro‐habitats of improved soil physical and nutrient status and reduced evapotranspiration. These encourage the growth of mesic, palatable and high yielding perennial grasses in otherwise arid environments. A two‐year... -
Nutritional evaluation of Ficus thonningii Blume leaves as ruminant livestock feed in the Ahferom district of Tigray, Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Daniel H Berhe --- Axum Agricultural Research Centre, Ethiopia Agena A Tanga --- Plant Science, EthiopiaWe evaluated the fodder quality of Ficus thonningii Blume in the Ahferom district of Tigray, Ethiopia. Determination of foliar macronutrients and proximate chemical compositions was undertaken using five diameter classes (11–20, 21–30, 31–40, 41–50 and 51–60 cm at breast height)... -
The effect of long-term mowing and ungulate exclusion on grass species composition and soil nutrient status on the Athi-Kapiti plains, central Kenya
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: D. Berliner J. KiokoThe long-term (>30 years) impacts of mowing (for hay-making) and ungulate exclusion, on natural, unfertilised rangelands were investigated. Changes in grass species composition and soil nutrient status were measured The study site, situated on the Athi-Kapiti plains of central Kenya,... -
Soil fertility management in pasture small-plot trials: potential pitfalls
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: N. Miles M.B. HardySmall-plot cutting trials are of particular importance in research relating to intensive pastures. Undetected changes in soil fertility during the course of experimentation may detract from the validity of results in trials of this kind. Information from field trials conducted... -
Nutrient cycling by Acacia erioloba (syn. Acacia giraffae) in smallholder agroforestry practices of a semi-arid environment in the North West Province, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R.N. Murovhi S.A. MaterecheraAcacia erioloba is an ecologically important indigenous leguminous tree in semi-arid areas of Southern Africa because of the many benefits it offers to local communities. However, little quantitative plant and soil data exist to explain its ability to enhance soil... -
Relationships between growth, mineral nutrition and site factors for Eucalyptus camaldulensis (Dehnh) planted in some communal areas of Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Abisai Mushaka --- Forest Research Centre, ZimbabweThe Forestry Commission of Zimbabwe has been implementing a Rural Afforestation Project since 1983. The main species promoted were the eucalypts, especially Eucalyptus camaldulensis (Dehnh). A survey of twenty-seven woodlots of E. camaldulensis with ages between I and 10 years... -
Nutrient levels of three Eucalyptus species/provenances, measured over four seasons in a trial along the sandy, dry, Cape West Coast of South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: F. Ellis --- Faculty of Forestry, A. van Laar --- Faculty of Forestry,Foliage nutrient content of 3 to 6-year old Eucalyptus species/provenances (E. camaldulensis, E. globulus and E. grandis x E. tereticornis) were analysed for eleven elements over a four-year period. The trial was planted on three sites, adjacent to each other,... -
Nutrition education and counselling as strategic interventions to improvehealth outcomes in adult outpatients with HIV: a literature review
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: HannahL. Kaye --- , South Africa CarlosJ. Moreno-Leguizamon --- , South AfricaMalnutrition poses a significant risk for people living with HIV and accelerates disease progression. This is because adequate nutrition is essential for optimal immune function. This article discusses research on the role and use of nutrition education or counselling as... -
Aftermath of simultaneous toxic spills in the Klein Nyl River, Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Jooste L PollingIn late August 1998, a mechanical malfunction at the Nylstroom Sewage Treatment Works resulted in a massive quantity of untreated sewage flowing into the Klein Nyl River. Simultaneously, 5km upstream, a poly-aromatic hydrocarbon poison was simultaneously leaked into the same... -
The influence of downstream changes in water quality on phytoplankton composition in the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Sanet Janse van Vuuren AJH PieterseLinks between spatial differences in phytoplankton composition and changes in environmental variables in the Vaal River, South Africa, were investigated. Multivariate analysis showed that the most important environmental variables influencing algal abundance were turbidity, conductivity, nutrient concentrations and temperature. Of... -
The response of Cyperus papyrus (L.) and Miscanthidium violaceum (K. Schum.) Robyns to eutrophication in natural wetlands of Lake Victoria, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Kipkemboi --- Department of Zoology, Kenya F Kansiime --- , Uganda P Denny --- , The NetherlandsInterrelationships between nutrient concentrations and aerial biomass, root numbers, length and rhizomes size in Cyperus papyrus (L.) (papyrus) and Miscanthidium violaceum (K. Schum.) Robyns (synonymous to Miscanthus violaceus (K. Schum) Pilg.) were established in five different wetlands around the northern... -
Phytoplankton and some abiotic features of El-Bardawil Lake, Sinai, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Touliabah --- Department of Biology, Canada HM Safik --- Department of Botany, Faculty of Science, Egypt MM Gab-Allah --- Department of Botany, Faculty of Science, Egypt WD Taylor --- Department of Biology, CanadaEl-Bardawil Lake is a large coastal lagoon on the Mediterranean coast of Sinai, Egypt. Although it is shallow and oligotrophic, it is one of the most important lakes in Egypt as a source of good quality fish and a habitat... -
Impact of drain water on water quality and eutrophication status of Lake Burullus, Egypt, a southern Mediterranean lagoon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EM Ali --- Department of Environmental Sciences, EgyptThe ecological and biological status of Lake Burullus was examined in 2006 to determine its water quality and eutrophication status in response to the quality and quantity of drain water entering it. The lake suffers from excessive nutrient concentrations. Chlorophyll... -
The influence of pool size on species diversity and water chemistry in temporary rock pools on Domboshawa Mountain, northern Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Anusa --- Tropical Resources Ecology Programme (TREP), Department of Biological Sciences, Zimbabwe HGT Ndagurwa --- Tropical Resources Ecology Programme (TREP), Department of Biological Sciences, Zimbabwe CHD Magadza --- Tropical Resources Ecology Programme (TREP), Department of Biological Sciences, ZimbabweThe effect of pool size (area and depth) on species diversity and physicochemical characteristics of rock pool habitats on Domboshawa Mountain, northern Zimbabwe, was studied from December 2006 to May 2007. Pools were categorised based on maximum depth. Pool duration... -
Seasonal occurrence, distribution and diversity of phytoplankton in the Douala Estuary, Cameroon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AB Fonge --- Department of Botany and Plant Physiology, Cameroon BG Chuyong --- Department of Botany and Plant Physiology, Cameroon AS Tening --- Department of Chemistry, Cameroon AC Fobid --- Department of Botany and Plant Physiology, Cameroon NF Numbisi --- Department of Botany and Plant Physiology, CameroonThe occurrence and abundance of phytoplankton in the Wouri and Dibamba rivers and the Douala Estuary and their relationships to physico-chemical conditions were studied during the wet and dry seasons of 2008. One-hundred-and-sixty-eight species belonging to 67 genera were identified... -
Litter Fall and Decomposition in Stands of Mature Pinus radiata
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D.B. Versfeld --- Department of Water Affairs, Forestry and Environmental Conservation,Rates of litter fall in mature stands of Pinus radiata D. Don have been monitored at the Jonkershoek Forestry Research Station since 1976. Decomposition trials were laid out in June 1977. Litter fall has been collected on six sites in... -
Seasonal Changes in Foliar Nutrient Content of E. grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- ,The monthly variations in the concentrations of six macro- and four micro-nutrients in the foliage of Eucalyptus grandis were studied at three different sites for a period of two years, when the trees were between one and three years of... -
6. Foliar Diagnosis and Fertiliser Prescription in Forestry—The DRIS System and its Potential
Item type: Journal Article • Journal: South African Forestry Journal • Authors: C.J. Schutz --- D.R. de Wet Forestry Research Centre, Dept. of Environment Affairs, J.M. de Villiers --- ,Problems associated with current foliar diagnosis techniques are reviewed. Many of these problems have been overcome in agricultural crops by use of the Diagnosis and Recommendation Integrated System (ORIS). The foundation of DRIS is the concept of nutrient balance, the... -
ZOOPLANKTON AND ESTUARINE RELICT (BENTHIC) FAUNA IN LAKE MZINGAZI, A FRESHWATER COASTAL LAKE OF NATAL
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: B.K. Fowles --- , South Africa C. G.M. Archibald --- , South AfricaLake Mzingazi, a natural, undisturbed freshwater coastal lake in the heart of the Richards Bay municipal area, is threatened by rapid urban and industrial growth. The previously unrecorded composition and distribution of zooplankton in the lake was studied during 1979... -
FUTURE CHALLENGES IN WATER QUALITY MODELLING WITH PARTICULAR REFERENCE TO OPERATIONALLY CLOSED CATCHMENTS
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: S.F. Forster --- Department of Water Affairs, South Africa F.A. Stoffberg --- Department of Water Affairs, South Africa J.A. van Rooyen --- Department of Water Affairs, South AfricaAs a result of the declining quality of many water sources, the use of water quality models in planning is increasing. To date applications have involved the simulation of total dissolved salts and nutrients, largely in catchments affected by urban... -
Distribution of nutrients, chlorophyll and phytoplankton primary production in relation to hydrographic structures bordering the Benguela-Angolan frontal region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Wasmund H-U Lass G NauschThe aim of this study was to determine the characteristic rates of phytoplankton production in water bodies bordering the Benguela-Angolan frontal region and differing in their hydrographic, hydrochemical and biological properties. Two cruises were undertaken in the vicinity of the... -
Influence of nutrient concentrations on the seasonal abundance and distribution of Cyanophyceae in the coastal region of Mount Cameroon
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PM Oben BO ObenWater management in the coastal region of Mount Cameroon is threatened by extensive and persistent noxious blooms of Cyanophyceae (blue-green algae) in the surface and near-surface mesotrophic and eutrophic zones. Nutrient concentrations and species composition of Cyanophyceae were investigated from... -
Overgrazing of edible algae as a mechanism behind red tides and harmful algal blooms
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Johannessen E Dahl O LindahlIt has recently been suggested that there is a positive synergistic relationship between herbivorous zooplankton and their algal food, with herbivores stimulating the production of their preferred species while negatively affecting competing algal species. A prerequisite for this positive interaction... -
The effects of physiology and behaviour on the near-bottom distributions of Kareniabrevis on the West Florida shelf: a numerical study
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GA Sinclair D KamykowskiThe distribution of near-bottom populations of Karenia brevis depends on both cell physiology and behaviour. The migration distance of cells, and the subsequent exposure to light, may vary as a result of the nocturnal uptake of nitrate. The adaptive advantage... -
Pigment signatures of phytoplankton composition in the northern Benguela ecosystem during spring
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow D Louw M Balarin J AlheitPigment indices were used to investigate the distribution and composition of phytoplankton in the northern Benguela during the austral spring of 2000, with sampling being conducted on five transect lines between 19°S and 25°S and at other inshore stations on... -
Patterns of diversity along experimental gradients of disturbance and nutrient supply—the confounding assumptions of the Intermediate Disturbance Hypothesis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MC Pfaff --- Department of Zoology, South Africa C Hiebenthal --- , Germany M Molis --- , Germany GM Branch --- Department of Zoology, South Africa M Wahl --- , GermanyA model of the interactive effects of disturbance and productivity on diversity predicts peak diversity to shift towards higher disturbance regimes as productivity increases, confining the Intermediate Disturbance Hypothesis to intermediate productivity levels. We conducted a two-factorial (disturbance, nutrients) field... -
The influence of site factors on nitrogen mineralization in forest soils of the Mpumalanga escarpment area: South africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J.H. Louwa --- , M. Scholes --- School of Animal, Plant & Environmental Sciences,The complex biophysical environmental conditions that occur in South Mrican forestry plantations prompt appropriate guidelines for nutrient management applications. Nutrient budget studies in plantation ecosystems indicated a negative nitrogen (N) balance on many sites. Empirical fertilizer trails have shown that,... -
Early performance of Casuarina junghuhniana provenances/land races at Lushoto, Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.T. Mwihomeket --- , Tanzania A.G. Mugasha --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania S.A.O. Chamshama --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania M.A. Mgangamundo --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania O.C. Kumburu --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania Z. Lupala --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, TanzaniaA trial involving 21 provenances form Indonesia and 7 “local” seed sources of Casuarina junghuhniana was established at Lushoto, Tanzania in March 1997. At 22 and 48 months of age, the following characteristics were assessed: survival, root collar diameter (RCD... -
Foliar nutrient levels as indicators of site quality for Pinus patula in the Mpumalanga escarpment area
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J.R. Louw --- , M.C. Scholes --- School of Plant, Animal & Environmental Sciences, South AfricaThe South African forest industry is based on intensively managed monoculture systems, and requires diagnostic tools for the development of site-related nutrient management policies. Worldwide, the evaluation of foliar nutrient concentrations is one of the most widely used techniques in... -
A review of management impacts on the soil productivity of South African commercial forestry plantations and the implications for multiple-rotation productivity
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Louis Titshall --- Institute for Commercial Forestry Research, South Africa Steven Dovey --- Institute for Commercial Forestry Research, South Africa Diana Rietz --- Institute for Commercial Forestry Research, South AfricaAn overview of southern African research that has investigated the impact of management practices that can potentially affect the long-term site productivity of plantations is presented, with an emphasis of these impacts on soil productivity and with the implications for... -
Environmental impact of seasonal integrated aquaculture ponds ('fingerponds') in the wetlands of Lake Victoria, Kenya: an assessment, with the aid of Bayesian Networks
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Julius Kipkemboi AnneA van Dam Patrick DennyThe potential effect on ecosystem integrity of the use of natural wetlands for seasonal wetland fishponds ('fingerponds'), integrated with vegetable production for livelihood demands, was evaluated using experimental sites at Lake Victoria, Kenya. Soluble reactive phosphorous and total phosphorus, ammonium,... -
Influence of environmental factors on seasonal changes in clupeid catches in the Kigoma area of Lake Tanganyika
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IA Kimirei YD MgayaAn investigation into the relationship between the fluctuating physico-chemical environment and variability in fish catches in the Kigoma, Tanzania, area of Lake Tanganyika was conducted from January to December 2003. Catch per unit effort (kg fishing unit–1 night–1) showed two... -
Trends analysis relating to pollution in Sakumo Lagoon, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ruby Asmah Hedrick Dankwa CA Biney CC AmankwahSakumo Lagoon, situated near Accra, is a Ramsar-listed coastal wetland threatened by urban and agricultural waste, being located in an urban area where access to domestic and waste disposal facilities is a major problem. The aim of this study was... -
The effects of soil conditions and grazing strategy on plant species composition in a semi-arid savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M-L Britz D WardThe tree:grass ratio of savannas is important, especially in the semi-arid savannas of South Africa. An increase in tree cover leads to reduced productivity and profitability of rangelands. We investigated the effects of soil type and grazing strategy on the... -
Inducible defences in Acacia sieberiana in response to giraffe browsing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AD Zinn D Ward K KirkmanAcacia trees comprise a principal component of the diet of many African browsers. The resultant browsing pressure has led to the evolution of both physical and chemical responses in Acacia trees. In an observational study, we investigated the physical and... -
Dynamics of woody vegetation in a semi-arid savanna, with a focus on bush encroachment
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M-L Britz D WardIncreases in the tree: grass ratio with accompanying changes in herbaceous composition, called bush or shrub encroachment, is a worldwide phenomenon in savanna regions. Although heavy grazing by livestock is often believed to be the cause, it is clear that... -
Estimating biomass and macronutrient content of some commercially important plantation species in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: SB Dovey --- , South AfricaThe removal of biomass, in any combination of stemwood, bark or branch harvesting, can cause a significant increase in nutrient loss from commercial timber plantations. Ensuring long-term site productivity of forest plantations is a key issue for forestry management. Managers... -
Health and nutrition of plantation eucalypts in Asia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: B Dell G Hardy T BurgessUnderstanding site fertility constraints has lifted productivity of eucalypt plantations in East and South-east Asia through targeted application of inorganic fertilisers. Whilst most attention has been given to the supply of nitrogen and phosphorus in silvicultural prescriptions, and inoculation with... -
Effect of water trophic level on the impact of the water hyacinth moth Niphograpta albiguttalis on Eichhornia crassipes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Canavan --- Department of Zoology and Entomology, South Africa JA Coetzee --- Department of Zoology and Entomology, South Africa MP Hill --- Department of Zoology and Entomology, South Africa ID Paterson --- Department of Zoology and Entomology, South AfricaEutrophication contributes to the proliferation of alien invasive weed species such as water hyacinth Eichhornia crassipes. Although the South American moth Niphograpta albiguttalis was released in South Africa in 1990 as a biological control agent against water hyacinth, no post-release... -
Mineralisation of organic fertilisers used by urban farmers in Harare and their effects on maize (Zea mays L.) biomass production and uptake of nutrients and heavy metals
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Armwell Shumba --- Department of Soil Science and Agricultural Engineering, Zimbabwe Ronald Marumbi --- Department of Soil Science and Agricultural Engineering, Zimbabwe Blessing Nyamasoka --- Department of Soil Science and Agricultural Engineering, Zimbabwe Phillip Nyamugafata --- Department of Soil Science and Agricultural Engineering, Zimbabwe Justice Nyamangara --- Matopos Research Station, Zimbabwe Simon Madyiwa --- Department of Soil Science and Agricultural Engineering, ZimbabweNutrient release patterns and heavy metal contamination risks associated with animal manure and organic municipal wastes used as basal fertilisers are largely unknown in Zimbabwe. Carbon, nitrogen and phosphorus mineralisation patterns were determined in a 56-day incubation experiment of domestic... -
Assessing the ability of fodder beet (Beta vulgaris L. ‘Brigadier’) to absorb sodium from a soil irrigated with sodium-enriched water
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Philip A Myburgh --- Agricultural Research Council–Infruitec/Nietvoorbij, South Africa Carolyn L Howell --- Agricultural Research Council–Infruitec/Nietvoorbij, South AfricaA pot experiment was carried out to determine the sodium (Na) absorption ability of halophytic fodder beet (Beta vulgaris L. ‘Brigadier’) irrigated with water enriched to Na levels found in winery wastewater. Treatments comprised (1) soil without plants irrigated with... -
Current opinion: Is added dietary sugar detrimental to health?
Item type: Journal Article • Journal: South African Family Practice • Authors: VL Van den Berg --- Department of Nutrition and Dietetics,The intake of added dietary sugars has escalated dramatically since the 1970s, mostly due to a global increase in the consumption of sugar-sweetened beverages (SSBs). This trend has sparked concerns among scientists and consumers alike regarding the safety of added... -
Microalgal responses to physico-chemical variability in the small temporarily open/closed Seteni Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NK Carrasco --- School of Life Sciences, South Africa R Perissinotto --- School of Life Sciences, South AfricaThe Seteni Estuary is a small temporarily open/closed estuary (TOCE) in South Africa under the influence of agricultural practices. While the general significance of microalgae to estuarine production is widely recognised, the factors regulating microalgal biomass in these heterogeneous systems... -
Responses of primary producers to mouth closure in the temporarily open/closed Great Brak Estuary in the warm-temperate region of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Nunes --- Department of Botany, South Africa JB Adams --- Department of Botany, South AfricaLow river inflow conditions during 2009/2010 resulted in the mouth of the Great Brak Estuary remaining closed for almost two years. The low water level in Wolwedans Dam resulted in no annual environmental flow releases being made, causing mouth closure... -
Improving productivity and sustainability of successive rotations of Acacia auriculiformis plantations in South Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vu Dinh Huong --- Forest Science Institute of South Vietnam, Vietnam EK Sadanandan Nambiar --- CSIRO Land and Water Flagship, Australia Le Thanh Quang --- Forest Science Institute of South Vietnam, Vietnam Daniel S Mendham --- CSIRO Land and Water Flagship, Australia Pham The Dung --- Forest Science Institute of South Vietnam, VietnamWe studied the productivity of Acacia auriculiformis plantations in South Vietnam over three successive rotations covering 15 years. The focus of our study was on the effects of inter-rotation management on stand growth and soil properties. Contrastin g slash and... -
The nutrient intake of children aged 12–36 months living in two communities in the Breede Valley, Western Cape province, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: TA Balogun --- Division of Community Health, South Africa MJ Lombard --- Division of Human Nutrition, South Africa M McLachlan --- Division of Human Nutrition, South AfricaObjective: The objective of this study was to describe the current macro- and micronutrient intake of children (both boys and girls) in two selected communities in the Breede Valley, Worcester. -
Water hyacinth hotspots in the Ugandan waters of Lake Victoria in 1994–2012: implications for management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FM Wanda --- National Fisheries Resources Research Institute (NaFIRRI), Uganda M Namukose --- National Fisheries Resources Research Institute (NaFIRRI), Uganda M Matuha --- National Fisheries Resources Research Institute (NaFIRRI), UgandaWater hyacinth invaded Lake Victoria in the 1980s and, by 1998, had attained peak coverage of approximately 2 000 ha in the Ugandan waters of the lake. Control interventions, especially via biological means, significantly reduced the weed's coverage to non-nuisance... -
A critical view on the soil fertility status of minimum-till kikuyu–ryegrass pastures in South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Pieter A Swanepoel --- Department of Agronomy, South Africa Chris C du Preez --- Soil, Crop and Climate Sciences, South Africa Philip R Botha --- Research and Technology Development Services, Department of Agriculture Western Cape, South Africa Hennie A Snyman --- Animal, Wildlife and Grassland Sciences, South AfricaCultivated pastures provide increased productivity and contribute inter alia to food security. Rangelands in the southern Cape region of South Africa have had a low animal production potential and were therefore improved through time as cultivated pastures. Initially, annual pastures... -
Seasonal changes of nutrient levels and nutrient resorption in Avicennia marina leaves in Yingluo Bay, China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Shudong Wei --- College of Life Sciences, China Xiaowei Liu --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, China Lihua Zhang --- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, China Hui Chen --- College of Life Sciences, China Hui Zhang --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, China Haichao Zhou --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, China Yiming Lin --- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, ChinaAvicennia marina is a typical mangrove species of subtropical coastlines of China. However, little is known about the retention of nutrients by this species in oligotrophic, coastal environments. In this study, seasonal changes in nitrogen (N) and phosphorus (P) concentrations,... -
Relationship between plant growth and organic acid exudates from ectomycorrhizal and non-ectomycorrhizal Pinus patula
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Rasheed Adeleke --- Department of Microbiology and Plant Pathology, South Africa T Eugene Cloete --- Department of Microbiology and Plant Pathology, South Africa Annick Bertrand --- Soil and Crops Research and Development Centre, Canada Damase P Khasa --- Centre for Forest Research and Institute of Integrative and Systems Biology, CanadaPlant–mycorrhizal interaction is an important association in the ecosystem with significant impacts on the physical, biological and chemical properties of the soil. In the present study, potential relationships that exist between organic acid production by ectomycorrhizal pine seedlings and plant... -
Prospecting cyanobacterial formulations as plant-growth-promoting agents for maize hybrids
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Radha Prasanna --- Division of Microbiology, India Firoz Hossain --- Division of Genetics, India Santosh Babu --- Division of Microbiology, India Ngangom Bidyarani --- Division of Microbiology, India Anurup Adak --- Division of Microbiology, India Shikha Verma --- Division of Microbiology, India Yashbir Singh Shivay --- Division of Agronomy, India Lata Nain --- Division of Microbiology, IndiaCyanobacteria represent environment-friendly inputs that can lead to savings of nitrogenous fertilisers, in addition to improving plant growth and soil fertility. The present investigation aimed to evaluate the potential of cyanobacteria inoculants as nutrient-management and plant-growth-promoting options for maize hybrids,... -
Assessing the potential benefits of organic and mineral fertiliser combinations on legume productivity under smallholder management in Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Grace Kanonge --- Chemistry and Soils Research Institute, Zimbabwe Florence Mtambanengwe --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, Zimbabwe Muneta G Manzeke --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, Zimbabwe Hatirarami Nezomba --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, Zimbabwe Paul Mapfumo --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, ZimbabweProductivity of grain legumes on sandy soils of southern Africa is critically limited by marginal fertilisation. Effects of co-applying phosphorus (P)-based mineral fertilisers and organic nutrient resources to cowpea (Vigna unguiculata (L.) Walp.) and soyabean (Glycine max L.) were investigated... -
Factors influencing women’s decisions to purchase specific children’s multi-nutrient supplements in the Gauteng Province (South Africa)
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: T. Merlin --- Department of Human Nutrition, School for Health Care Sciences, Gj. Gericke --- Department of Human Nutrition, School for Health Care Sciences, Pj. Bekker --- Biostatistics Unit, South AfricaAbstract -
The prevalence of anaemia and selected micronutrient status in pregnant teenagers of Polokwane Municipality in the Limpopo Province
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Mm Bopape --- Human Nutrition Programme, Xg Mbhenyane --- Department of Human Nutrition, M Alberts --- Medical Sciences Programme,Objective: The objective of this study was to determine the iron, folate and vitamin B12 status of pregnant teenagers in the Limpopo Province. -
Development of a Malian food exchange system based on local foods and dishes for the assessment of nutrient and food intake in type 2 diabetic subjects
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: A. Coulibaly --- Département des sciences des aliments et de nutrition, Faculté des sciences de l’agriculture et de l’alimentation, Canada Ht O’Brien --- Département des sciences des aliments et de nutrition, Faculté des sciences de l’agriculture et de l’alimentation, Canada I. Galibois --- Département des sciences des aliments et de nutrition, Faculté des sciences de l’agriculture et de l’alimentation, CanadaObjective: To develop exchange lists for the assessment of food and nutrient intakes for people with diabetes in Mali. -
Alcohol intake and micronutrient density in a population in transition: the transition and health during urbanisation in South Africa (THUSA) study
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: M Serfontein --- Centre of Excellence for Nutrition, South Africa C Venter --- Centre of Excellence for Nutrition, South Africa A Kruger --- Centre of Excellence for Nutrition, South Africa U MacIntyre --- Institute of Human Nutrition, South Africa Pt Pisa --- Centre of Excellence for Nutrition, South AfricaObjective: To investigate the possibility of micronutrient dilution by alcohol in the diets of an adult population in nutrition transition. -
The importance of access to food intake data
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: M. Herselman --- Division of Human Nutrition; Faculty of Health Sciences, L Du Plessis --- Community Nutrition; Division of Human Nutrition, Faculty of Health Sciences, -
Measuring micronutrient intakes at different levels of sugar consumption in a population in transition: the Transition and Health during Urbanisation in South Africa (THUSA) study
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Ue MacIntyre --- Department of Human Nutrition, Cs Venter --- North-West University, A. Kruger --- North-West University, M. Serfontein --- North-West University,Objective: The objective was to investigate the absolute micronutrient intake and the possibility of micronutrient dilution of added sugar in the diets of an African population in nutritional transition. -
The effect of a combination of nutrition education, soy and vegetable gardening, and food preparation skill training interventions on dietary intake and diversity in women: a case study from Qwa-Qwa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: W. Oldewage-Theron --- Visiting Professor, Centre of Sustainable Livelihoods, South Africa A. Egal --- Director, Centre of Sustainable Livelihoods, South AfricaObjective: The objective of the study was to determine if an integrated food and nutrition intervention, including home gardening, nutrition education and recipe development and training, would improve dietary diversity in women. -
Decomposition of cattle dung on grazed signalgrass (Brachiaria decumbens Stapf) pastures in monoculture or intercropped with tree legumes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hugo NB Lima --- Animal Science, Brazil Jose C Dubeux Jr --- North Florida Research and Education Center, USA Mercia VF dos Santos --- Animal Science, Brazil Alexandre CL de Mello --- Animal Science, Brazil Mario A Lira --- Animal Science, Brazil Marcio V Cunha --- Animal Science, BrazilLivestock excreta is one of the major nutrient sources in natural grasslands. Understanding how livestock diet and season affects the decomposition dynamics is critical to nutrient cycling models. We hypothesised that livestock diet and season of the year affect dung... -
Consumption and wastage of home-fortified maize flour products in northern Malawi
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: G Mphwanthe --- Department of Human Nutrition and Health, Malawi AA Kalimbira --- Department of Human Nutrition and Health, Malawi NC Geresomo --- Department of Human Nutrition and Health, MalawiObjective: The objective of the study was to determine the amount of home-fortified maize flour products consumed and wasted by women aged 15–49 years, and children aged ≤ 5 years. -
Consuming the daily recommended amounts of dairy products would reduce the prevalence of inadequate micronutrient intakes in the United States: diet modelling study based on NHANES 2007–2010
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Erin E Quann --- Dairy Management Inc., USA Victor L Fulgoni --- Nutrition Impact, LLC, USA Nancy Auestad --- Nutrition Insights, LLC, USABackground: A large portion of Americans are not meeting the Dietary Reference Intakes (DRI) for several essential vitamins and minerals due to poor dietary choices. Dairy products are a key source of many of the nutrients that are under consumed,... -
A brief overview of the ACEP project: Ecosystem Processes in the KwaZulu-Natal Bight
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ST Fennessy --- Oceanographic Research Institute, South Africa MJ Roberts --- Branch: Oceans and Coasts, South Africa AW Paterson --- South African Institute for Aquatic Biodiversity, South AfricaThis introductory paper lays the basis for this supplementary issue by briefly presenting the state of knowledge on the KwaZulu-Natal (KZN) Bight at the start of this multi-disciplinary, multi-institutional, ship-based research project that ran from 2009 to 2013. The rationale... -
Summer and winter differences in zooplankton biomass, distribution and size composition in the KwaZulu-Natal Bight, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Pretorius --- University of the Western Cape, South Africa JA Huggett --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa MJ Gibbons --- University of the Western Cape, South AfricaZooplankton biomass and distribution in the KwaZulu-Natal Bight were investigated in relation to environmental parameters during summer (January–February 2010) and winter (July–August 2010). Mean zooplankton biomass was significantly higher in winter (17.1 mg dry weight [DW] m–3) than in summer... -
Distribution of calcareous nannoplankton in surface sediments along the northern KwaZulu-Natal Bight, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MN Ovechkina --- Geological Sciences, School of Agricultural, Earth and Environmental Sciences, South Africa MB Mostovski --- School of Life Sciences, South Africa R Uken --- Geological Sciences, School of Agricultural, Earth and Environmental Sciences, South AfricaThe coccolith assemblages from seafloor sediments over the inner shelf in the northern region of the KwaZulu- Natal Bight on the east coast of South Africa were identified and their distribution determined. In all, 29 Recent species and taxonomic groups,... -
Dynamics and role of the Durban cyclonic eddy in the KwaZulu-Natal Bight ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LA Guastella --- Bayworld Centre for Research and Education, South Africa MJ Roberts --- Ocean Sciences and Marine Food Security, South AfricaThe semi-permanent Durban Eddy is a mesoscale, lee-trapped, cold-core cyclonic circulation that occurs off the east coast of South Africa between Durban in the north and Sezela, some 70 km to the south. When present, strong north-eastward countercurrents reaching 100... -
Diet and childhood asthma: review
Item type: Journal Article • Journal: South African Family Practice • Authors: Irene L Labuschagne --- Faculty of Medicine and Health Sciences, South Africa Evette van Niekerk --- Faculty of Medicine and Health Sciences, South AfricaChildhood asthma is the most common chronic inflammatory childhood disease with almost 20% children and adolescents reporting asthma symptoms in South Africa. Associations between asthma and dietary antioxidants (vitamin E, vitamin C, carotenoids, selenium, polyphenols, and fruit), polyunsaturated fatty acids... -
Health assessment of freshwater fish species from Albasini Dam, outside a DDT-sprayed area in Limpopo province, South Africa: a preliminary study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UMC Nibamureke --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaDuring 2006 to 2008, the water, sediment and fish in Albasini Dam, used as a reference site outside a DDT-sprayed area, had been found to be as affected as those in the nearby DDT-sprayed area were. Accordingly, the aim of... -
Effect of short-duration overnight cattle kraaling on grass production in a southern African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Pamela Sibanda --- National University of Science and Technology, Zimbabwe Allan Sebata --- National University of Science and Technology, Zimbabwe Edward Mufandaedza --- Africa Centre for Holistic Management, Zimbabwe Mukai Mawanza --- National University of Science and Technology, ZimbabweRanch owners in eastern and southern Africa have embraced a new rangeland management practice of keeping cattle overnight in temporary livestock corrals (hereafter referred to as kraals) within rangelands for short durations (for example, one week) to improve grass production... -
Effect of phosphorus and nitrogen sources on essential nutrient concentration and uptake by maize (Zea mays L.) during early growth and development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Pieter-Ernst Coetzee --- Department of Soil, Crop and Climate Sciences, South Africa Gert M Ceronio --- Department of Soil, Crop and Climate Sciences, South Africa Chris C du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaIn South Africa, maize is often produced on highly weathered soils with low organic matter contents. These soils are unable to supply sufficient nitrogen (N) and phosphorus (P) for sustainable maize production, resulting in the use of fertiliser sources containing... -
Nutrient addition increases biomass of soil fungi: evidence from a South African grassland
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zivanai Tsvuura --- School of Life Sciences, South Africa Meghan L Avolio --- National Socio-Environmental Synthesis Center, USA Kevin P Kirkman --- School of Life Sciences, South AfricaTheory predicts that nutrient addition to soil reduces the benefit of mycorrhizal associations to plants. This study sought to determine how long-term management of soil fertility influences the abundance of fungal mycelium. Ingrowth mesh bags were used to measure mycelial... -
Variations in water and macronutrient uptake of soilless tomato as affected by the nutrient solution composition
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Estelle Kempen --- Department of Agronomy, South Africa G André Agenbag --- Department of Agronomy, South Africa Stan Deckers --- Soil Service of Belgium, BelgiumGreenhouse growers must reduce the nutrients that leach from soilless growing systems. To enable continued use of nutrient solutions, the water and nutrient uptake by plants in soilless systems needs to be quantified. Plants were grown in water culture with... -
Diagnosing foliar nutrient dynamics of Eucalyptus grandis in KwaZulu-Natal, South Africa, using optimal element ratios and the diagnosis and recommendation integrated system (DRIS)
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: JM Campion MC ScholesFertilisation is one of the most cost-effective methods of increasing and maintaining the productivity of Eucalyptus grandis plantations in South Africa. This silvicultural practice can be optimised by using the foliar nutrient ratios measured in plants at maximum growth as... -
Long-term livestock grazing increases the recruitment success of epigeal termites: insights from a >75-year grazing experiment in the Karoo, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: James G Hagan --- Department of Biological Sciences, South Africa Justin CO du Toit --- Grootfontein Agricultural Development Institute, South Africa Michael D Cramer --- Department of Biological Sciences, South AfricaEpigeal termites alter ecosystem-level processes through foraging and mound building. These effects are proportional to density. Whilst much is known about the factors influencing mound density in natural settings, how termites respond to livestock grazing has been overlooked. We compared... -
Key factors that drive phytoplankton biomass and community composition in the urbanised Nahoon Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Cotiyane --- Department of Botany, South Africa J Adams --- Department of Botany, South Africa A Rajkaran --- Department of Biodiversity and Conservation Biology, South AfricaEstuaries are under intense pressure, because of urban developments and water abstraction. Water column characteristics of the Nahoon Estuary were examined in 2014–2015 to identify factors that influenced phytoplankton dynamics. The estuary was found to be saline (∼33) and remained... -
Terrestrial discharge influences microbioerosion and microbioeroder community structure in coral reefs
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SA Mwachireya --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya M Carreiro-Silva --- Department of Oceanography and Fisheries (IMAR network), Portugal BE Hartwick --- Department of Biological Sciences, Canada TR McClanahan --- Wildlife Conservation Society, Marine Programs, USAMicrobioerosion rates and microbioeroder community structure were studied in four Kenyan protected coral-reef lagoons using shell fragments of Tridacna giant clams to determine their response to the influence of terrestrial run-off. Fourteen different microbioeroder traces from seven cyanobacteria, three green... -
Use of diatom indices to categorise impacts on and recovery of a floodplain system in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Musa --- Department of Zoology, South Africa R Greenfield --- Department of Zoology, South AfricaThe trophic status of the Ramsar-accredited Nyl River floodplain, which is stressed by sewage treatment effluents, and its ability to restore normal conditions, were assessed in 2014–2015 using diatoms as biological indicators. The Trophic Diatom Index, Specific Pollution Sensitivity Index... -
Seasonal diet composition and forage selectivity of Boer goats in a semi-arid gypsophilous grassland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Miguel Mellado --- Department of Animal Nutrition, Mexico José A Villarreal --- Department of Botany, Mexico Miguel A Medina-Morales --- Department of Animal Nutrition, Mexico José R Arévalo --- Department of Parasitology, Ecology and Genetics, Spain José E García --- Department of Animal Nutrition, Mexico Cesar Meza-Herrera --- University Regional Unit of Arid Zones, MexicoBotanical and chemical compositions of Boer goat diets, determined with repeated collection of forage samples taken from the goat’s mouth, were studied in a gypsophilous grassland during four seasons of the year. Ten pluriparous goats were used to collect selected... -
Association of micronutrients and child growth in children aged 7-15 years from Qwa-Qwa, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Abdulkadir Egal --- Centre of Sustainable Livelihoods, South Africa Wilna Oldewage-Theron --- Centre of Sustainable Livelihoods, South AfricaObjectives: This study investigated the possible associations between micronutrient deficiencies and child growth in the rural community of Qwa-Qwa in the Free State province of South Africa (SA). -
Determinants of Consumers’ Choice and Willingness to Pay for Biofortified Pearl Millet in Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: Silas O. Ongudi --- Department of Agricultural Economics and Agribusiness Management, Kenya M.W. Ngigi --- Department of Agricultural Economics and Agribusiness Management, Kenya P.K. Kimurto --- Department of Crops, Horticulture and Crop Sciences, KenyaGlobally, micronutrient deficiency is a major health concern as more than two billion people suffer from iron deficiency, 1.75 billion are at risk of low zinc intake, while 127 million pre-school children suffer from vitamin A deficiency. Consumption of iron... -
Allometric models for estimation of aboveground biomass of Gmelina arborea Roxb. in pulpwood plantations of Bangladesh
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lulu Rayhan Khushi --- Forestry and Wood Technology Discipline, Bangladesh Mahmood Hossain --- Forestry and Wood Technology Discipline, Bangladesh SM Rubaiot Abdullah --- Forestry and Wood Technology Discipline, Bangladesh Sanjoy Saha --- Centre for Integrated Studies on the Sundarbans, Bangladesh Mohammad Raqibul Hasan Siddique --- Forestry and Wood Technology Discipline, BangladeshGmelina arborea Roxb. is a fast-growing, deciduous tree species native to Bangladesh. It has been widely planted since 1992 for commercial production of pulpwood in hilly areas of Bangladesh. The purpose of this study was to derive well-fitting allometric models... -
The influence of phosphorus and calcium application rates on the mineral composition of the perennial legume Macrotyloma axillare
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Karina Batista --- Instituto de Zootecnia, Brazil Luciana Gerdes --- Instituto de Zootecnia, Brazil Alessandra Aparecida Giacomini --- Instituto de Zootecnia, Brazil Waldssimiler Teixeira de Mattos --- Instituto de Zootecnia, Brazil Ivani Pozar Otsuk --- Instituto de Zootecnia, BrazilThe response of legumes to the supply of either phosphorus (P) or calcium (Ca) alone has been extensively investigated but no prior studies have evaluated their combinations in the perennial legume Macrotyloma axillare (Macrotyloma legume). This study assessed the mineral... -
Long-term effects of pig slurry application on selected soil quality parameters and tissue composition of maize in a subhumid subtropical environment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tichaedza J Chikuvire --- School of Agricultural Earth and Environmental Sciences, South Africa Pardon Muchaonyerwa --- School of Agricultural Earth and Environmental Sciences, South Africa Rebecca Zengeni --- School of Agricultural Earth and Environmental Sciences, South AfricaEffects of long-term application of pig slurry (PS) on soil organic carbon (SOC) pools, nutrients and maize tissue composition under continuous conventional tillage in a maize–soyabean rotation system in subhumid subtropical environments are unclear. The soil and plant parameters have... -
Nutrient status of sandy soils in smallholder areas of Zimbabwe and the need to develop site-specific fertiliser recommendations for sustainable crop intensification
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Gabriel Soropa --- Department of Environmental Sciences and Technology, Zimbabwe Justice Nyamangara --- Department of Environmental Sciences and Technology, Zimbabwe Ermson Z Nyakatawa --- Department of Crop Science and Post Harvest Technology, ZimbabweSustainable crop intensification in sub-Saharan Africa cannot be achieved if farmers cultivate inherently infertile soils that are deficient in key essential nutrients, such as nitrogen and phosphorus. Most smallholder farmers in sub-Saharan Africa are resource-constrained and apply suboptimal fertiliser amounts,... -
Forest gap size can efficiently promote litter decomposition and nutrient release in south-western China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Xun Li --- Key Laboratory of Ecological Forestry Engineering, China Danju Zhang --- Key Laboratory of Ecological Forestry Engineering, China Yan Zhang --- Key Laboratory of Ecological Forestry Engineering, China Jian Zhang --- Key Laboratory of Ecological Forestry Engineering, China Simeng Song --- Key Laboratory of Ecological Forestry Engineering, China Yang Zhou --- Key Laboratory of Ecological Forestry Engineering, ChinaForest gaps are important in forest dynamics and management; however, the gap size that is most conducive to the decomposition of litter and promotion of nutrient cycling in forests remains poorly understood. The mass loss and nutrient release from Pinus... -
Physico-chemical analysis of soils for the better yield of sugarcane and rice using Heber soil quality index
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: A Rajendran --- Department of Chemistry, India M Shanmuganathan --- Research and Development Centre, Bharathiar University, IndiaSoil quality plays an important role in the assessment of sustainable land-use systems. Assessment of soil quality will always help farmers to apply correct fertilisers in correct proportions to their soil. This will definitely help them achieve maximum yield with... -
Effect of mound-building termites on soil physicochemical properties and sugarcane stalk heights
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile S Mthimkhulu --- South African Sugarcane Research Institute, South Africa Neil Miles --- South African Sugarcane Research Institute, South Africa Louis W Titshall --- South African Sugarcane Research Institute, South Africa Phesheya Dlamini --- Department of Plant Production, Soil Science and Agricultural Engineering, South AfricaThis study investigated soil factors responsible for localised patches of enhanced sugarcane growth on the remains of termite (Macrotermes natalensis) mounds observed on predominantly coarse-textured soils (weak sands) of KwaZulu-Natal province, South Africa. Soil samples (0–20 cm depth) were collected... -
The effect of conditioning Acacia mearnsii De Wild. hedge-plants under shadenetting on rooting, elemental uptake and productivity of cuttings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sascha L Beck-Pay --- Institute for Commercial Forestry Research, University of KwaZulu-Natal, South Africa Mark D Laing --- Discipline of Plant Pathology, School of Agricultural Earth and Environmental Sciences, South AfricaAcacia mearnsii is a commercial forestry tree in South Africa, largely grown from open-pollinated seeds. Clonal deployment of superior selections of the species is restricted due to its poor rooting ability. The effects of conditioning parent hedge-plants under three levels... -
Preliminary observations suggest Common Myna prefer lipid over protein and carbohydrate foods in a pairwise choice experiment
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: S Thobeka Gumede --- DST-NRF Centre for Invasion Biology, South Africa Colleen T Downs --- DST-NRF Centre for Invasion Biology, South AfricaCommon Mynas Sturnus tristis, previously known as Acridotheres tristis, are considered among the world’s worst most invasive species. However, relatively little is known about the factors that affect their persistence and spread in new environments. They have been observed feeding... -
Effect of vermicompost tea on rooibos (
Aspalathus linearis ) growth and rhizosphere microbial diversity under field conditionsItem type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Stefanus G van Heerden --- Department of Soil Science, South Africa Ailsa G Hardie --- Department of Soil Science, South AfricaIncreasing demand for rooibos tea (Aspalathus linearis) requires producers to increase production in a sustainable manner. The aim of the study was to examine the effect of applying vermicompost tea (VCT) (100 and 500 L ha–1 month–1) and tap water... -
Dietary intake as a cardiovascular risk factor: a cross-sectional study of bank employees in Accra
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Ivy Priscilla Frimpong --- Diet Therapy Department, 37 Military Hospital, Ghana Matilda Asante --- Department of Nutrition and Dietetics, School of Biomedical and Allied Health Sciences, Ghana Aloysius Nwabugo Maduforo --- Department of Nutrition and Dietetics, NigeriaObjectives: To determine the dietary and nutrient intakes of bank employees in Accra in relation to recommended dietary intake for the control of cardiovascular diseases (CVD). -
The effectiveness of riparian zones in mitigating water quality impacts in an agriculturally dominated river system in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CR Petersen --- , South Africa NZ Jovanovic --- , South Africa MC Grenfell --- , South AfricaThis study evaluates relationships between contrasting land uses representing an anthropogenic impact gradient in a coastal agricultural catchment, and riparian vegetation, as reflected in changes in nutrient dynamics and water quality. The objectives were to: 1) determine the water and... -
Growth and metabolism of Clarias gariepinus (Burchell, 1822) fed with copepods (Eucyclops sp.) exposed to lead and titanium dioxide nanoparticles
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MM Matouke --- , Nigeria MK Mustapha --- , NigeriaThe increasing uses of lead (Pb2+) and titanium dioxide nanoparticles (nTiO2) in commercial products have led totheir increased discharge into aquatic environments. This study investigated the effects of the interaction betweennTiO2 and lead (Pb2+) in a simple freshwater food web... -
Annual litter production in a Brazilian Cerrado woodland savanna
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Alan N Costa --- , Brazil Alessandra Bartimachi --- , Brazil Heraldo L Vasconcelos --- , USA Emilio M Bruna --- , USA Ernane HM Vieira-Neto --- , USAThe Brazilian Cerrado is a heterogeneous ecosystem where annual woody-layer litter production shows strong spatiotemporal variation. Although Cerrado litter dynamics have been well-documented in forest physiognomies, knowledge from savanna habitats remains limited despite their predominance across the landscape. In this... -
Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Minu --- , Tanzania J Routh --- , Sweden JF Machiwa --- , Tanzania S Pamba --- , TanzaniaDeterminations of spatial and temporal variations in organic matter and nutrient dynamics in water and sediments are crucial for understanding changes in aquatic bodies. In this study, we (i) determine the spatial dynamics of dissolved inorganic nutrients, during the transition... -
Effect of encroaching woody plant species on soil nutrients and selected soil chemical properties in communally managed semiarid savanna grazing lands in the North West province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Pieter W Malan --- , South Africa Makuété A P Tiawoun --- , South Africa Khumoetsile S Molatlhegi --- , South Africa Simeon A Materechera --- , South AfricaWoody plant encroachment is recognised as one of the major threats to biodiversity in ecosystems. In many arid and semiarid areas of South Africa, indigenous encroacher species are proliferating, but the factors that favor their abundance are poorly understood. This... -
Traditional green leafy vegetables as underutilised sources of micronutrients in a rural farming community in south-west Nigeria II: consumption pattern and potential contribution to micronutrient requirements
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Shirley Isibhakhomen Ejoh --- , France Faustina Dufie Wireko-Manu --- , France David Page --- , France Catherine MGC Renard --- , FranceObjective: To determine the consumption pattern of selected households consuming traditional green leafy vegetables (TGLVs) during three seasons and potential contribution to recommended nutrient intakes. -
Long-term wheat production management effects on soil fertility indicators in the semi-arid eastern Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Palo Francis Loke --- , South Africa Johannes Jacobus Schimper --- , South Africa Elmarie Kotzé --- , South Africa Christiaan Cornelius du Preez --- , South AfricaThis study evaluated temporal effects of wheat production management practices on soil fertility under semi-arid conditions. Treatments applied for 37 years included straw management (unburned and burned), tillage practices (no-tillage, stubble mulch, and mouldboard ploughing) and weed control methods (chemical... -
A comparison of zinc sources and extraction methods on sandy soils suitable for maize cropping
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CF Wessels --- , South Africa LF van Straaten --- , South Africa CC du Preez --- , South Africa GM Ceronio --- , South AfricaMaize is the most important crop produced for human and animal nourishment in South Africa. The crop is susceptible to zinc (Zn) deficiencies, which result in lower grain yields with poorer nutritional value. Knowledge of the nature and behaviour of... -
A review of the limnology of the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Mangaliso J Gondwe --- , Botswana Mike Murray-Hudson --- , Botswana Nashaat M Mazrui --- , Botswana Oliver Moses --- , Botswana Edwin Mosimanyana --- , Botswana Oarabile Mogobe --- , BotswanaWater quantity and quality are important aspects in the management of aquatic ecosystems, including wetlands. This paper has integrated available knowledge from literature on the limnology of the Okavango Delta, Botswana. The current near-natural solute concentrations in the inflow waters... -
Soil fertility trends and management in Conservation Agriculture: a South African perspective
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: GP Nortjé --- , South Africa MC Laker --- , South AfricaConservation Agriculture (CA) is an integrated approach that consists of a suite of practices, namely no-till farming, cover crops, and crop rotation that includes at least three crops. In the global context, CA is implemented widely in South America (Argentina... -
Increasing resilience to the SARS-CoV-2 virus and other health threats in food-insecure communities
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Karen Morris --- , South Africa Thandi Puoane --- , South AfricaThe health of the majority of South Africa’s population is seriously threatened by hunger and micronutrient deficiency, with impaired immune response a real threat, which the current SARSCoV-2 virus pandemic has highlighted. Traditional household food-processing techniques can, amongst other advantages,... -
Early growth and development of maize on sandy soils fertilised with zinc sources at different application rates
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LF van Straaten --- , South Africa CF Wessels --- , South Africa GM Ceronio --- , South Africa CC du Preez --- , South AfricaThe grain yield and quality of maize is often negatively influenced by zinc (Zn) deficiencies during early growth and development. Application of Zn to soil is therefore a necessity, especially when it is sandy. Glasshouse experiments were carried out to... -
Is the largest African penguin colony in South Africa influencing local ocean productivity?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Passuni --- , South Africa LRD Human --- , South Africa SN Riddick --- , United States P Pattrick --- , South Africa M Bizani --- , South Africa SHP Deyzel --- , South Africa NA Strydom --- , South Africa TG Bornman --- , South Africa L Pichegru --- , South AfricaIn coastal waters, nutrient supplies originate principally from allochthonous sources, such as inputs from rivers, estuaries or oceanic waters. Recently, it has been suggested that marine life contributes to the nutrient load, with penguin colonies being the largest contributor worldwide... -
Influence of phosphorus fertiliser blends on grain yield, nutrient concentration, and profitability of soyabeans in the southern Guinea Savannah of Ghana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Samuel Adjei-Nsiah --- , Ghana John K Ahiakpa --- , Ghana Kwesi Gyan --- , Ghana Fred Kanampiu --- , KenyaWe conducted on-farm trials in the southern Guinea savannah of Ghana in 2016 and 2017 to evaluate soyabean response to three fertiliser blends to guide farmers towards profitable adoption of appropriate phosphorus fertiliser blend for improved soyabean production. Old Yara... -
Macrophyte species diversity and distribution in relation to water quality of the Cheleleka Wetland in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Haymanot Tesfaye --- , Ethiopia Bikila Warkineh --- , EthiopiaThe Cheleleka Wetland is located in the Ethiopian Rift Valley on the upper shore of Lake Hawassa, after which the regional capital is named. This study investigated the relationship between water quality and the occurrence and diversity of macrophyte species... -
Use of biological and water quality indices to evaluate conditions of the Upper uMngeni Catchment, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R van Deventer --- , South Africa CD Morris --- , South Africa TR Hill --- , South Africa NA Rivers-Moore --- , South AfricaUrban and agricultural land uses have the potential to severely compromise the quality of impoundments, if ineffectively managed and operated. A case in point is the upper uMngeni Catchment, including Midmar Dam, which is integral to the freshwater supply infrastructure... -
Effect of biochar, farmyard manure, and lime on soil properties, and on growth and nutrient uptake of wheat on acidic soils in Southern Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mekedes Lulu --- , Ethiopia Bekele Lemma --- , Ethiopia Legesse Hidoto --- , Ethiopia Asmare Melese --- , EthiopiaThis study assessed the effect of the interactions of biochar (BC), farmyard manure (FYM) and lime on soil chemical properties, and on different wheat attributes in Southern Ethiopia. The experimental design was a randomised complete block in three replications. The... -
The use of linear programming to determine whether breastfed infants can achieve a nutritionally adequate complementary feeding diet: a case study of 6–11-month-old infants from KwaMashu, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Nazeeia Sayed --- , South Africa Hettie C Schönfeldt --- , South Africa -
Forage legumes from the Mediterranean Fynbos biome of South Africa with potential for domestication: slope aspect affects tissue fibre and mineral composition
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Samson BM Chimphango --- , South Africa Luke H Gallant --- , South Africa M Igshaan Samuels --- , South Africa Odette E Curtis-Scott --- , South Africa A Muthama Muasya --- , South Africa Clement Cupido --- , South Africa James S Boatwright --- , South Africa John Howieson --- , AustraliaFabaceae plants contribute greatly to a high quality of pasture in rangelands, because of high levels of protein in their tissues. Despite this established importance, only a few southern African legumes have been evaluated for nutritional value and domestication. The... -
Yield, nutritional composition, and consumer acceptability of sweetpotato cultivars cultivated with soil amendments in the Middleveld of Eswatini
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Samuel Kofi Tutu --- , Eswatini Henry R Mloza Banda --- , Eswatini Cinisani Tfwala --- , EswatiniUncertainties about the effects of nutrient amendment on the culinary attributes of sweetpotato have limited fertiliser use in Eswatini. The study was carried out at a moist and dry location of Eswatini to investigate the culinary and nutritional attributes of... -
Determination of foliar nutrient sufficiency ranges in cultivated rooibos tea using the boundary-line approach
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacobus FN Smith --- , South Africa Ailsa G Hardie --- , South AfricaDespite the global importance of rooibos tea (Aspalathus linearis (Burm.f.) R.Dahlgren) as a health-promoting crop, foliar nutrient sufficiency ranges have not yet been determined for commercially cultivated rooibos. Determination of these ranges is critical for assessing plant nutrient status and... -
Effect of nutrition education on nutritional status and serum zinc level of HIV and AIDS clients: implication for care in resource-limited settings
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Ifeyinwa Ezenwosu --- , Nigeria Osita Ezenwosu --- , Nigeria Chinyere Mbachu --- , Nigeria Ijeoma Itanyi --- , Nigeria Emmanuel Aguwa --- , NigeriaBackground: People living with HIV or AIDS in resource-limited settings are faced with challenges in their nutrition and micronutrient levels. This study aimed to determine the effect of nutrition education on the nutrition status and serum zinc level of HIV... -
Nitrogen mineralisation and N2O emissions in pure and mixed-species plantations of Eucalyptus urograndis and Acacia mangium
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Felipe Martini Santos --- , Brazil Fabiano de Carvalho Balieiro --- , Brazil Danilo Henrique dos Santos Ataíde --- , Brazil Pedro Vaz da Rocha --- , Brazil Bruno JR Alves --- , Brazil Guilherme M Chaer --- , BrazilWe hypothesised that N inputs to the soil from residues of adult trees of Acacia mangium Willd. increase soil nitrate availability and consequently induce higher nitrous oxide (N2O) fluxes, irrespective of being in pure or mixed stands with Eucalyptus. A... -
Nutrient use efficiency in commercial eucalypt plantations in different soils under temperate climate
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Alejandro González --- , Uruguay Jorge Hernández --- , Uruguay Amabelia del Pino --- , Uruguay Andrés Hirigoyen --- , UruguayThe sustainability of forest production is based on an adequate balance between soil nutrient supply and its demand by forest plantations, which may vary depending on the species and the site. In Uruguay, the low to medium fertility of the... -
Drivers of periphyton biomass in south-western Cape rivers, South Africa, and the implications for management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JL Ewart-Smith --- , South AfricaIn open-canopied temperate rivers, periphyton plays a pivotal role by converting dissolved nutrients into food for biota. International research suggests that periphyton is particularly responsive to flow and nutrient alterations and therefore ideally suited to aiding the prediction and monitoring... -
Effects of form, fineness and placement of lime with and without soil tillage on barley and canola growth and development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: JR van der Nest --- , South Africa AG Hardie --- , South Africa J Labuschagne --- , South Africa PA Swanepoel --- , South AfricaNo-tillage systems and slow movement of surface-applied limestone can lead to stratification of soil acidity. Incorporation of lime by tilling soil is not preferred by producers following conservation agriculture practices. There is limited research on ways to facilitate lime movement... -
Influence of cropping sequences on labile carbon and phosphorus fractions in a wheat-based conservation agriculture system
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: NZ Sosibo --- , South Africa E Dube --- , South Africa P Muchaonyerwa --- , South Africa TJ Tsilo --- , South AfricaWhile conservation agriculture (CA) has largely been successful in many areas, some reports suggest that certain farmers have not realised the benefits they had hoped for, especially in Africa. The benefits of CA could depend on the cropping sequences involved... -
The chemistry of the pedoderm – part 4: grasslands and savannas within Mokala National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony J Mills --- , South Africa Klaus Kellner --- , South AfricaTreed savannas and treeless grasslands occur across Mokala National Park, South Africa. To identify soil properties potentially underpinning these marked differences in vegetation structure, we analysed the soil chemistry of 27 composite pedoderm samples in both savannas and grasslands. Savannas... -
The chemistry of the pedoderm – part 1: grasslands and savannas in the central Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony J Mills --- , South Africa Tercia Strydom --- , South Africa Jessica L Allen --- , South Africa Julia Baum --- ,Treeless grasslands occur within landscapes that are predominantly wooded savannas in the central Kruger National Park, South Africa. As a first step in identifying soil properties potentially underpinning differences in vegetation structure in these landscapes, we analysed the soil chemistry... -
The chemistry of the pedoderm – part 2: Dichrostachys cinerea patches and adjacent grassland in the southern Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony J Mills --- , South Africa Tercia Strydom --- , South Africa Jessica L Allen --- , South AfricaThe small tree, Dichrostachys cinerea, occurs in dense patches within grasslands on gabbro-derived soils in the southern Kruger National Park. It is not known whether soil properties in the grasslands affect tree establishment. As a first step in identifying soil... -
The chemistry of the pedoderm – part 3: Colophospermum mopane shrublands and woodlands in the central Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anthony J Mills --- , South Africa Tercia Strydom --- , South Africa Jessica L Allen --- , South Africa Julia Baum --- ,The woody plant, Colophospermum mopane, occurs as either a shrub or tree in shrublands and woodlands, respectively, in the central Kruger National Park, South Africa. As a first step in identifying which soil properties potentially influence the structure of C... -
Dietary intake of first- and third-year female dietetics students at a South African university
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Nikki L Verwey --- University of Pretoria, South Africa Joyce Jordaan --- University of Pretoria, South Africa Friedeburg AM Wenhold --- University of Pretoria, South Africa -
Sludge as an initial nutrient driver for yield improvement in the poor soils of northern Namibia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ehsan Ebrahimi --- University of Rostock, Germany Jana Zinkernagel --- Hochschule Geisenheim University, GermanyThe northern part of Namibia suffers from drought and low-quality soil. The soil needs a boost of nutrients, and the water must be used in a frugal manner. Thereby, the objective of this research was to investigate the effect of... -
Genotypic variability in nutrient uptake and use efficiency in chickpea grown under low phosphorus availability in a Mediterranean climate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Hanine Loucif --- Université Djilali Bounaama de Khemis Miliana, Algeria Brahim Bousalhih --- Université Djilali Bounaama de Khemis Miliana, Algeria Rebiha Chaoui --- Université Djilali Bounaama de Khemis Miliana, Algeria Jean Jacques Drevon --- Université de Montpellier, France Mohamed Farissi --- Sultan Moulay Slimane University, Morocco Mohamed Lazali --- Université Djilali Bounaama de Khemis Miliana, AlgeriaLow phosphorus (P) availability is a major constraint for chickpea production. Consequently, P-efficient genotypes can improve productivity under conditions where the higher application of P is not economical. This study was conducted to characterise four chickpea genotypes for nutrient uptake... -
Kraals or bomas increase soil carbon and fertility across several biomes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Mia Momberg --- University of Pretoria, South Africa Anna Jean Haw --- , Kenya Perushan Rajah --- , South Africa Jacques van Rooyen --- , Kenya Heidi-Jayne Hawkins --- , South AfricaKnowledge about how pastoralism and kraaling may contribute to desired global objectives, such as soil fertility, is in danger of being lost. We tested whether short duration kraaling increases soil fertility across various biomes and countries via a meta-analysis (random... -
Exploring the prevalence of multiple forms of malnutrition in children 6–18 years living in the Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Gugulethu T Moyo --- Texas Tech University, United States Abdulkadir A Egal --- Somali National University, Somalia Wilna Oldewage-Theron --- Texas Tech University, United States -
The effects of suspended bivalve culture on benthic community structure and sediment fluxes in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TA Probyn --- Fisheries and the Environment (DFFE), South Africa M Pretorius --- Fisheries and the Environment (DFFE), South Africa F Daya --- Fisheries and the Environment (DFFE), South Africa A du Randt --- Fisheries and the Environment (DFFE), South Africa A Busby --- Fisheries and the Environment (DFFE), South AfricaThis study provides a follow-up to prior measurements of the impact of mussel Mytilus galloprovincialis farming on benthic macrofauna and biogeochemistry and includes the first measurements of the effect of oyster Crassostrea gigas farming in Saldanha Bay, South Africa. The... -
Diet quality of adults with poorly controlled type 2 diabetes mellitus at a tertiary hospital outpatient clinic in Tshwane District, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Hanel Duvenage --- University of Pretoria, South Africa Gerda J Gericke --- University of Pretoria, South Africa Jane W Muchiri --- University of Pretoria, South AfricaObjective: To describe the dietary intake and its quality of patients with poorly controlled type 2 diabetes mellitus (T2DM) by assessing the dietary variety (DVS), dietary diversity (DDS), nutrient adequacy ratio (NAR) and mean nutrient adequacy ratio (MAR). -
Energy and nutrient contribution of different food groups to the dietary intake of 6- to <9-month-old infants in a low socioeconomic community in North West Province, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Tshiphiri Mukwevho --- North-West University, South Africa Cornelius M Smuts --- North-West University, South Africa Hannah Asare --- North-West University, South Africa Mieke Faber --- North-West University, South Africa -
Limnological features and water-quality changes of two Ethiopian Rift Valley lakes, Lake Abaya and Lake Chamo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Dagne --- National Fishery and Aquatic Life Research Center, Ethiopia H Tadesse --- National Fishery and Aquatic Life Research Center, Ethiopia K Teshome --- National Fishery and Aquatic Life Research Center, EthiopiaWe conducted a study in Lake Abaya and Lake Chamo, the two largest Ethiopian Rift Valley lakes, between 2016 and 2019, to evaluate their limnological features and infer longer-term changes in some water-quality parameters. Data generated through in situ measurements... -
Magnesium and zinc fertilisation improves rice yield and yield component responses to nitrogen, phosphorus, and potassium
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Firmin N Anago --- University of Abomey-Calavi, Benin Emile C Agbangba --- University of Abomey-Calavi, Benin Brice C T Oussou --- National Institute of Agronomic Research of Benin, Benin Gustave D Dagbénonbakin --- National Institute of Agronomic Research of Benin, Benin Lucien G Amadji --- University of Abomey-Calavi, BeninThe aim of this study was to assess the effects of magnesium (Mg) and zinc (Zn) on the response of rice to nitrogen (N), phosphorus (P), and potassium (K) application. Two sets of field experiments were carried out in Benin... -
Soil nutrient deficiency assessment under soybean cropping systems using the DRIS system in northern and central Benin
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- Integrated Soil and Crop Management Research Unit, Benin --- Agricultural Research Centre (CRA) of Agonkanmey, Benin --- Polytechnic School of Abomey-Calavi, Benin --- Agricultural Research Centre (CRA) of Agonkanmey, Benin --- University of Abomey-Calavi, Benin --- Integrated Soil and Crop Management Research Unit, Benin --- Integrated Soil and Crop Management Research Unit, BeninSoybean is one of the promising crops in the Benin agro-industrial sector, but its production is carried out at the expense of the inherent soil fertility. The present study aims to apply the DRIS (Diagnosis and Recommendation Integrated System) for... -
Nutritional properties and in vitro gas production in cactus pear (Opuntia stricta) and cassava (Manihot esculenta) shoot silages
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: --- Universidade Federal do Vale do São Francisco, Brazil --- Universidade Federal do Agreste de Pernambuco, Brazil --- Universidade Federal do Vale do São Francisco, Brazil --- Universidade Estadual do Sudoeste da Bahia, Brazil --- Universidade Federal do Tocantins, Brazil --- Universidade Federal do Agreste de Pernambuco, Brazil --- Universidade Federal do Agreste de Pernambuco, Brazil --- Universidade Federal do Agreste de Pernambuco, Brazil --- , Brazil --- Universidade Federal do Maranhão, Brazil --- Universidade Federal do Vale do São Francisco, BrazilThis study evaluated the effects of different inclusion levels of cactus pear (Opuntia stricta) (at 0%, 15%, 30% or 45% on fresh matter basis) ensiled with shoots of cassava (Manihot esculenta) on the mineral nutrients, carbohydrates fractionation, nitrogen compounds and... -
Determination of optimal soil pH and nutrient concentrations for cultivated rooibos tea using the boundary line approach
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacobus FN Smith --- Stellenbosch University, South Africa Ailsa G Hardie --- Stellenbosch University, South AfricaOptimal soil pH and nutrient conditions for rooibos cultivation in South Africa have not yet been established as limited field research has been conducted. Soil chemical (0–300 mm) and yield data were collected from 120 commercial rooibos plantations in the main... -
Nutrient uptake and yield response of wheat (Triticum spp.) to different fertiliser applications in Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Shimbahri Mesfin --- Land Resource Management and Environmental Protection, Mekelle University, Ethiopia Mitiku Haile --- Land Resource Management and Environmental Protection, Mekelle University, Ethiopia Girmay Gebresamuel --- Land Resource Management and Environmental Protection, Mekelle University, Ethiopia Amanuel Zenebe --- Land Resource Management and Environmental Protection, Mekelle University, Ethiopia Abera Gebre --- Soil Resource and Watershed Management, Aksum University, Ethiopia Christy van Beek --- Wageningen University and Research Centre, the NetherlandsIn northern Ethiopia, the persistently low crop yield is often attributed to inadequate soil fertility and inappropriate fertiliser recommendations. This study employed the Quantitative Evaluation of the Fertility of Tropical Soils (QUEFTS) model for site-specific fertiliser recommendations to enhance wheat... -
Zoning the occurrence of
Thyrinteina arnobia in eucalypts and its relationship with the spectral behaviour of canopies and soil attributesItem type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Caíque Carvalho Medauar --- , Brazil Samuel de Assis Silva --- , Brazil Luis Carlos Cirilo Carvalho --- State University of Santa Cruz, Brazil Willian Bucker Moraes --- Federal University of Espírito Santo, Brazil Marcus Vinicius Masson --- State University of Paulista, Brazil Ricardo Previdente Martins --- , Brazil Sidinei Dallacort --- , Brazil João Mendes Cicarini Hott --- Federal University of Espírito Santo, BrazilThis study aimed to outline areas at risk of the occurrence of eucalypt defoliator caterpillars and their relationship with variations in the spectral behaviour of canopies and soil attributes. The study was conducted in three eucalypt plantation areas of the... -
Biomass production and nutritional efficiency in short rotation eucalypt clone plantations for energy in north-east Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Welluma Teixeira Barros --- State University of Southwest Bahia, Brazil Patrícia Anjos Bittencourt Barreto-Garcia --- State University of Southwest Bahia, Brazil Valdemiro da Conceição Júnior --- State University of Southwest Bahia, Brazil Marcos Gervasio Pereira --- Federal Rural University of Rio de Janeiro, Brazil Paulo Henrique Marques Monroe --- State University of Southwest Bahia, Brazil Maicon dos Santos da Silva --- São Paulo State University, Brazil Mariana dos Santos Nascimento --- State University of Southwest Bahia, Brazil Jaqueline Lima Morais --- State University of Southwest Bahia, BrazilSelecting adapted hybrids with greater efficiency in the use and return of nutrients is essential to ensure the success of forestry activities. Although topics on the nutritional sustainability of eucalypt biomass harvesting have frequently been discussed, few studies have focused... -
Nutritional improvement of cactus fruit scraps with addition of alfalfa or Atriplex halimus, and comparison of two animal feed preservation methods (silage and solar drying)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L El Hajji --- Sultan Moulay Slimane University, Morocco H Azzouzi --- Sultan Moulay Slimane University, Morocco M Achchoub --- Sultan Moulay Slimane University, Morocco K Elfazazi --- National Agricultural Research Institute, Morocco S Salmaoui --- Sultan Moulay Slimane University, MoroccoThis work aimed to study the effect of adding alfalfa (Medicago sativa L.) and Atriplex halimus L. on biochemical properties, microbial flora, ferment silage and solar-dried cactus fruit scraps. Alfalfa and Atriplex were added to cactus silage to improve nutrient... -
Why traditional diets are more relevant than ever today
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Karen Cheryl Morris --- Naturopath, South Africa Thandi Puoane --- University of the Western Cape, SAThe current epidemic of obesity and its co-morbidities reflect an urgent need to reform our modern eating patterns. This commentary proposes the reclamation of our traditional diets of the precolonial, preindustrial era, which are argued to be more sustainable, in... -
Evaluation of the effect of soil acidity amelioration on maize yield and nutrient interrelationships using stepwise regression and nutrient vector analysis
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. Jansen van Ransburg --- Department of Plant Production and Soil Science, University of Pretoria, Pretoria 0002, South Africa A.S. Claassens --- Department of Plant Production and Soil Science, University of Pretoria, Pretoria 0002, South Africa D.J. Beukes --- ARC-lnstitute for Soil, Climate and Water, Private Bag X79, Pretoria 0001, South AfricaThe interrelationships between elemental content of selected soil and leaf nutrients and maize grain yield were evaluated in a liming experiment conducted on a Hutton and Oakleaf soil in a resource-poor farming area in the Mpumalanga Province of South Africa... -
Rethinking radical veld improvement: a sustainable approach to grazing land restoration?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KP Kirkman --- University of KwaZulu-Natal, South AfricaRadical veld improvement (RVI), a concept explored in southern Africa during the mid to late 1900s, aimed to intensify agricultural landscapes by enhancing veld productivity by incorporating productive forage grasses or legumes, soil nutrient enrichment, or a combination of both... -
The influence of Connochaetes taurinus carcass decomposition on soil nutrient composition in grasslands
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: EA Kullander --- University of South Africa, South Africa MS Deutschländer --- University of South Africa, South Africa VM Ngole-Jeme --- University of South Africa, South Africa HI Melville --- University of South Africa, South AfricaDecomposing carcasses leach nutrients into soils, forming dense, nutrient-rich islands. The effect of liquid influx on ecological dynamics from decomposing blue wildebeest (Connochaetes taurinus) carcasses on soil nutrient content at various stages of decomposition in a grassland ecosystem was investigated... -
Effects of eucalypt and black wattle biochars from vacuum pyrolysis on sandy soil quality and cauliflower yield
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S Mncedi --- Stellenbosch University, South Africa JF Görgens --- Stellenbosch University, South Africa PA Swanepoel --- Stellenbosch University, South Africa AG Hardie --- Stellenbosch University, South AfricaWoody invasive alien plants (IAPs), including black wattle (Acacia mearnsii De Wild.) and eucalypt species (Eucalyptus camaldulensis Dehnh.), present significant environmental challenges in South Africa. Biochar from these plants can enhance soil carbon sequestration and fertility. This study examines the... -
Influence of spatio-temporal variations in precipitation and temperature on the productivity of Eastern Lake Kyoga, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: John Peter Obubu --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Robinson Odong --- Entomology and Fisheries Sciences, Makerere University, Uganda Seyoum Mengistou --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Tadesse Fetahi --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Tena Alamerew --- Ethiopian Institute of Water Resource, Addis Ababa University, Ethiopia Ekwacu Samuel --- Uganda National Meteorological Authority, UgandaSpatio-temporal variations in precipitation and temperature affect productivity in aquatic systems, mainly through nutrient dynamics. Shallow lakes are more vulnerable to spatio-temporal variations, yet they are an important resource for biodiversity conservation, water supply and fisheries. The eastern arm of... -
Are South African registered dietitians ready to take responsibility for prescription of parenteral nutrition and intravenous nutrients?
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: BJ Kroukam --- Stellenbosch University, South Africa AL Du Toit --- Groote Schuur Hospital, South Africa DG Nel --- Stellenbosch University, South Africa J Visser --- Stellenbosch University, South Africa -
Changes in the macrobenthic community structure associated with finfish farming in Richards Bay Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SF Nzama --- University of Zululand, South Africa L Vivier --- University of Zululand, South Africa A De Fortier --- University of Zululand, South AfricaGlobally, aquaculture has shown the potential to boost economic activity and enhance food security. However, controversy exists around large-scale finfish farming, with objections centred around potential environmental issues (especially eutrophication). Given this, the effects of a trial dusky kob (Argyrosomus... -
Comparison of rehabilitation methods on mechanically reconstructed soils following strip coal mining activities: effects on grass properties
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: DJ Beukes --- ARC-Soil, Climate and Water, South Africa LD Wiese --- ARC-Soil, Climate and Water, South Africa MV Kidson --- ARC-Soil, Climate and Water, South Africa F Breytenbach --- ARC-Livestock Business Division,Opencast coal mining has devastated the grassland biomes in the Mpumalanga Province of South Africa. A rain-fed rehabilitation trial on mechanically reconstructed soil, following strip coal mining, was conducted to demonstrate that the post-mining landscape can be returned to sustainable... -
2. “Enjoy a variety of foods”: as a food-based dietary guideline for South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Steyn NP --- Centre for the Study of Social and Environmental Determinants of Nutrition Population Health, Health Systems and Innovation, Human Sciences Research Council, Ochse R --- Tshwane University of Technology, Faculty Management Sciences, Department Hospitality Management,Eating a diverse diet is an internationally accepted recommendation for a healthy diet. The food-based dietary guideline (FBDG) “Enjoy a variety of foods” aims to encourage people to consume mixed meals, to increase variety by eating different foods from various... -
5. “Eat dry beans, split peas, lentils and soya regularly”: a food-based dietary guideline
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Venter CS [cor1] Vorster HH --- Centre of Excellence for Nutrition, Faculty of Health Sciences, North-West University, Potchefstroom Campus, Ochse R --- Tshwane University of Technology, Swart R --- University of the Western Cape,The objective of this paper is to review recent scientific evidence to support the food-based dietary guideline (FBDG): “Eat dry beans, split peas, lentils and soya regularly”. In this review, legumes are synonymous with the term “pulses”, while soy beans... -
7. “Have milk, maas or yoghurt every day”: a food-based dietary guideline for South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Vorster HH [cor1] Wenhold FAM --- Department of Human Nutrition, University of Pretoria, Wright HH --- Centre of Excellence for Nutrition, North-West University, Wentzel-Viljoen E --- Centre of Excellence for Nutrition, North-West University, Venter CS --- Centre of Excellence for Nutrition, North-West University, Vermaak M --- Consumer Education Programme of Milk SA,A national working group recently reached consensus that a guideline message for milk consumption should form part of the set of revised food-based dietary guidelines (FBDGs) for South Africa. The message was formulated as: “Have milk, maas or yoghurt every... -
Nutrient intake and dietary practice among adolescent girls in urban and rural areas of Kano State, Nigeria
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Hadiza Abdullahi Abubakar --- Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia, Mohd Razif Shahril --- Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia, Sumaiyah Mat --- Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia, -
Seventy-five years of insight – the impact of the Ukulinga very long-term grassland experiments
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- Agricultural Research Council – Animal Production Institute (ARC-API), South Africa Kevin P Kirkman --- University of KwaZulu-Natal, South AfricaTwo of the world’s oldest grassland experiments began in 1950/51 in Pietermaritzburg, South Africa. The Burning and Mowing Trial (BMT) tests how summer mowing and dormant-season burning or mowing regimes affect mesic grassland. The Veld Fertiliser Trial (VFT) examines how... -
Requirement for front-of-pack warning labels in South African porridges and cereals varies depending on preparation method and grain type
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Molatela K Mamabolo --- University of the Witwatersrand, South Africa Naledi Sibiya --- University of the Witwatersrand, South Africa Mmahiine Mosana --- University of the Witwatersrand, South Africa Fezeka N Cokile --- University of the Witwatersrand, South Africa Zibusiso Mkandla --- University of the Witwatersrand, South Africa Sanele Dlamini --- University of the Witwatersrand, South Africa Siphiwe N Dlamini --- University of the Witwatersrand, South Africa -
Comparative benchmarking of fertiliser uses for oilseed crop production in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: HT Ottermann --- , South Africa SJ Haarhoff --- Stellenbosch University, South Africa KJ Truter --- , South Africa F Meyer --- , South Africa D van der Westhuizen --- , South Africa PA Swanepoel --- Stellenbosch University, South AfricaThis study comparatively benchmarks fertiliser use over two periods (2013–2015; 2021–2023) in South Africa's oilseed crop production [soybean (Glycine max), canola (Brassica napus) and sunflower (Helianthus annuus)] against global trends, with a focus on major oilseed exporters. It explores fertiliser...