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Timber Harvesting in South Africa—Past, Present, Future
Item type: Journal Article • Journal: South African Forestry Journal • Authors: P.W. Warkotsch --- Faculty of Forestry,After a short description of South African timber harvesting practices in the past, the present situation in terms of machine population and the current harvesting and extraction methods is discussed in more detail. -
Cable Yarding in Southern Africa: An Analysis of its Productivity and Possible Procedure for its Improvement
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.M. de Laborde --- Institute for Commercial Forestry Research, South AfricaThe demand for timber in southern Africa is increasing and this is resulting in the afforestation of areas which require cable yarding when harvested. The demand for cable yarders, essentially fixed skylines, is therefore increasing rapidly. Stress is being placed... -
The Impact of Harvesting Operations on Timber Quality: Causes and Remedies
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Walter Warkotsch --- Forest Engineering Technology, Faculty of Forestry,Forests are devastated daily to satisfy the world's timber demands. Tropical forests throughout the world are exploited and endangered. An obligation therefore exists to avoid damage to timber and minimise waste wherever possible. -
Patterns of selection of Acacia karroo by goats and changes in tannin levels and in vitro digestibility following defoliation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.R. Teague --- , Republic of South AfricaPatterns of browse selection by Boer goats in a representative Acacia karroo community in the eastern Cape were studied. The rate of intake of browse was positively related to the leaf mass per unit length of the shoot. The ease... -
Implikasies van die oesindeks by navorsing verbouing van mielies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Hammes --- Departement Plantproduksie, R.E. Steynberg --- Departement Plantproduksie, E.A. Beyers --- Departement Plantproduksie, B. Kriel --- Departement Plantproduksie,Die oesindeks van mielies is bepaal in vier veldproewe. Verskille tussen mieliekultivars het voorgekom. Kultivars wat hoë graanopbrengste gelewer het in 'n kultivarproef, het ook deurgaans hoë oesindekswaardes gehad. In 'n langtermyn- bemestingsproef het behandelings wat kalium ontvang het, hoër... -
A growth model for sugar-cane based on a simple carbon balance and the CERES-Maize water balance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.G. Inman-Bamber --- , Republic of South AfricaThe economic optimum harvest age for sugar-cane depends to a large extent on how rates of photosynthesis and respiration change with age. A simple model of the carbon balance in which a constant photosynthetic efficiency was assumed, accounted to a... -
Maize response to plant population and soil water supply II. Plant barrenness and harvest index
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. van Averbeke --- Department of Agronomy, Ciskei J.N. Marais --- Department of Agronomy, CiskeiThe effects of level of water deficit and plant population density on plant barrenness and harvest index were investigated in a strictly controlled field experiment, repeated for four seasons. Differences in soil water supply were obtained by the seasonal variation... -
Some observations on rodent and antelope damage in commercial forest plantations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.S. Eccles --- , Republic of South Africa K.M. Little --- , Republic of South AfricaThe impact of various weeding and site-preparation treatments on Acacia mearnsii and Pinus patula damage by mammalian pests was assessed. Browsing by small antelope on Acacia mearnsii was significantly less in areas where harvesting residues had been retained rather than... -
Die invloed van saaityd op koring in 'n Mediterreense klimaat II. Opbrengs en opbrengskomponente
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.W. Loubser --- Departement van Landbou: Wes-Kaap, Republiek van Suid-AfrikaVerskille in opbrengs en proteïen by koring (Triticum aestivum L.) kan beter verklaar word indien meer kennis beskikbaar is oor die effek wat saaityd daarop het. Vier lentekoringkultivars is in 1991 op drie lokaliteite met 'n tipiese Mediterreense klimaat gesaai... -
Determination of the preharvest sprouting resistance of South African winter wheat (Triticum aestivum L.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Annelie Barnard --- , Republic of South Africa J.L. Purchase --- , Republic of South Africa MarieF. Smith --- , Republic of South Africa D. van Lill --- Department of Food, Clothing and Hotel Management, Technicon Free State, Republic of South AfricaPreharvest sprouting significantly reduces the quality of the South African wheat crop. This study classified the preharvest sprouting resistance of 17 South African winter wheat cultivars sampled over a range of typical winter wheat growth environments. Sampling was performed under... -
The development of harvesting schedules and post-harvesting management practices relative to oil yield of Eriocephalus punctulatus
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.N. Webber --- Department of Livestock and Pasture Science, Republic of South Africa M.L. Magwa --- Electron Microscope Unit, J. van Staden --- Department of Botany, University of Natal Pietermaritzburg, Republic of South AfricaThe first phase in the domestication programme of Eriocephalus punctulatus involved establishing how this crop could be harvested without adversely affecting plant vigour and longevity. The second phase of the domestication programme was the development of harvesting schedules that would... -
The harvest index of individual ears of four South African wheat (Triticum aestivum L.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.A. Metho --- Department of Agriculture and Environmental Affairs KwaZulu-Natal, Technology Development and Training (FSR), Republic of South Africa P.S. Hammes --- Department of Plant Production and Soil Science, Republic of South AfricaIncreasing the harvest index is a major route to higher yields in regions where a crop has had a lengthy period of selection and adaptation. No information could be found on differences in the harvest indices of the main stems... -
Effect of planting and harvesting dates on fungus-growing termite infestations in maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. van den Berg --- , South Africa H.F. Riekert --- , South AfricaFungus-growing termites (Microtermes spp. and Allodontermes spp.) damage maize roots and cause lodging. The pattern of attack, incidence of lodging, and the effect of planting and harvesting dates on damage and yield were studied in field trials over five seasons... -
The possible role of the oxidative pentose phosphate pathway in seed dormancy in winter wheat cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Barnard --- , South Africa J.C. Pretorius --- Department of Agronomy, South AfricaSeed dormancy is an important characteristic in small grain cultivars, because of its potential to prevent preharvest sprouting and the subsequent loss of quality. In this study the oxidative pentose pathway (OPP) activity in seeds of a preharvest sprouting susceptible... -
Amaranthus tricolor L. leaf yields affected by salinity, harvesting stage and harvesting methods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. E.M.M. Ribeiro --- Department of Agronomy, South Africa N. J.J. Combrink --- Department of Agronomy, South AfricaSingle Amaranthus tricolor seedlings were transplanted into containers filled with 5 I river sand and were fertigated with a ‘drain to waste’ system. Plants were grown in the open under warm summer conditions. Four to six daily applications of nutrient... -
Evaluating the maize production potential of a semi-arid ecotope with four production techniques
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.B. Zere --- Department of Soil, South Africa C.W. Huyssteen --- Department of Soil, South Africa M. Hensley --- Department of Soil, South AfricaWater conservation production techniques are needed to boost crop production in semi-arid areas. The in-field rainwater harvesting (IRWH) technique has been developed for this purpose, and found to be successful on clay and duplex soils, but has not yet been... -
Significance of kernel moisture content in determination of Hagberg Falling Number in wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Craven --- , South Africa A. Barnard --- , South Africa M.T. Labuschagne --- , South AfricaThe effect of early termination of kernel filling (early harvest) on the Hagberg Falling Number (HFN) was investigated over a four-year period. Selected South African wheat cultivars were harvested at different stages of kernel development, determined by kernel moisture content... -
Soil compaction under sugar cane (Saccharum hybrid sp.) cropping and mechanization in Mauritius
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.R. Ng Cheong --- , Mauritius K.F. Ng Kee Kwong --- , Mauritius C.C. Du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaFarm machinery is increasingly used in sugar cane production in Mauritius and is expected to cause soil compaction. A study was undertaken to ascertain whether the five major cane-growing soil groups of Mauritius were being compacted as a result of... -
Advances in soil physics: Application in irrigation and dryland crop production
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.D. van Rensburg --- Department of Soil, Crop and Climate Sciences, South AfricaThis is the third soil physics review to be published in South African Journal of Plant and Soil. In the previous reviews the focus was broad and covered almost every aspect of the subject, providing a comprehensive list of contributions... -
The effect of poor quality seed and various levels of grading factors on the germination, emergence and yield of wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Barnard --- , South Africa F.J. Calitz --- , South AfricaHigh quality seed is essential for establishing productive stands of wheat. Seed should have, amongst others, a high germination percentage, be free of seed borne diseases and should not contain any weed seed. Protein content (PC), hectolitre mass (HLM) and... -
Sugarcane cultivar x time of harvest interactions in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S. Ramburan --- , South AfricaThe adaptability of new sugarcane (Saccharum spp.) cultivars to time of harvest (TOH), and reasons for yield variability between harvest times are currently unclear in South Africa. The objectives of this study were to evaluate the adaptability of commercial cultivars... -
Morphological characters and ascorbic acid content of an elite genotype of Corchorus olitorius: the influence of moisture stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AnofiOT Ashafa --- Department of Plant Sciences, South Africa AbidemiA Abass --- Department of Botany, Nigeria Titilola Osinaike --- Department of Botany, Nigeria FrancisB Lewu --- Agriculture Department, South AfricaMoisture stress can be deleterious to physicochemical properties of crop species to a varying degree. The influence of moisture stress on the ascorbic acid content in the leaf and morphological characters of an elite genotype of Corchorus olitorius were tested... -
The effects of kelp harvesting on its regrowth and the understorey benthic community at Danger Point, South Africa, and a new method of harvesting kelp fronds
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: G. J. Levitt R. J. Anderson C. J. T. Boothroyd F. A. KempAt Danger Point, South Africa, mariculture of the abalone Haliotis midae has led to increased demand for freshly harvested kelp Ecklonia maxima. This study estimates the biomass of E. maxima available for harvesting, investigates the effects of harvesting on the... -
THE ZOOBENTHOS OF THE TOUW RIVER FLOODPLAIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. DAVIES --- Institute for Freshwater Studies, Republic of South AfricaAn eighteen month study (January 1979 - June 1980) of the sediment, emergent and submerged plant-associated benthic macro-invertebrates of the western sector of the Touw River Flood-plain is reported for four study sites: Wilderness Lagoon, the Touw River and East... -
The effect of harvesting operations, slash management and fertilisation on the growth of a Eucalyptus clonal hybrid on a sandy soil in Zululand, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: ColinW Smith Ben du ToitHarvesting operations during clearfelling and extraction of timber from commercial plantations result in many processes that may affect long-term site productivity such as soil compaction and residue manipulation. The objective of this work was to evaluate the effects of various... -
Production speed effects on log-making error rates and value recovery for a mechanized processing operation in radiata pine in New Zealand
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: G.E. Murphy H.D. Marshall A.W. EvansonMechanized processing operations are complex "man-machine" systems. The impacts of changes to work practices are, therefore, dependent on the effects the changes have on both the machine and the man. A mechanized processor, delimbing and cutting tree length stems into... -
An assessment of factors affecting early survival and growth of Pinus patula and Pinus elliottii in the summer rainfall region of southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C. A. Rolando K. M. LittleHigh initial mortality of pine seedlings planted in commercial timber plantations in the summer rainfall region of southern Africa has motivated research into possible causes. The objectives of this study were to assess whether survival and initial growth of Pinus... -
Age determination of miombo species Brachystegia spiciformis (Leguminosae – Caesalpinoideae) in Zimbabwe using growth rings
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: I.M. GrundyThe objective of this study was to determine whether Brachystegia spiciformis Benth. (Leguminosae – Caesalpinoideae), one of the dominants of dry miombo woodland in Zimbabwe, forms annual growth rings. In the past the production of effective cutting rotations and sound... -
Fish as a resource in a rural river catchment in the Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BCW van der WaalThe rural population in the Mutshindudi River valley, in the north-eastern corner of the Northern Province, accept locally-caught freshwater fish as food (85%), but tinned pilchards are the most commonly eaten fish. Fishing gear was recorded in 70% of the... -
Productivity Studies of a Large Scale Semi-mechanised Harvesting System for Shortwood in Hilly Terrain
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.M. de Laborde --- ,Large scale extraction of shortwood E. grandis timber by means of a semi-mechanised system in hilly terrain gives high productivity from clearfellings. The system employs wheeled tractors and manually loaded low-bed trailers for infield shortwood harvesting. Loads of five to... -
Harvesting of Pine and Eucalypt in South Africa
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Walter Warkotsch --- Faculty of Forestry,South Africa's geography, the forest resources and typical management practices are discussed. Most recent supply and demand prognosis data are cited to demonstrate the rapid growth rates and to indicate the growing importance of well designed and balanced harvesting operations. -
Could phosphorus concentrations increase with the development of cage culture in Lake Kariba, Zimbabwe?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- Department of Biological Sciences, Zimbabwe W Mhlanga --- Department of Environmental Science, Zimbabwe P Mwera --- Lake Harvest, Zimbabwe P Tendaupenyu --- Department of Biological Sciences, ZimbabweA comparison between historical and current data was done to determine whether the concentrations of total phosphorus, orthophosphate and chlorophyll a, and Secchi disc transparency, have changed in the Sanyati Basin of Lake Kariba following the commencement of cage culture... -
A simple method for rapid estimation of Ecklonia maxima and Laminaria pallida biomass using floating surface quadrats
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Rothman --- Department of Agriculture, South Africa RJ Anderson --- Department of Agriculture, South Africa JJ Bolton --- Department of Botany, South Africa CJT Boothroyd --- Department of Agriculture, South Africa FA Kemp --- Department of Agriculture, South AfricaIn South Africa two species of kelp, Ecklonia maxima and Laminaria pallida, occur in quantities sufficient for commercial use. Currently, the former species is harvested in large quantities (about 5 000 tonnes wet weight per year) as abalone feed. In... -
A framework for analyzing workforce dynamics in forest harvesting in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Killian Tendai Manyuchi --- Forest Engineering: Department of Forestry Sciences, South Africa ReinoE. Pulkki --- Forest Engineering: Department of Forestry Sciences, South Africa R.P.F --- Faculty of Forestry and the Forest Environment, CanadaPeople are the industry's most valuable asset. However, due to its dynamic nature, labour cannot be owned but only rented. A framework for measuring, monitoring and managing labour dynamics is used and tested in forest harvesting operations in South Africa... -
Management options For Australian Blackwood (Acacia melanoxylon) in Southern Cape Forests, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: A.H.W. Seydack --- Department of Water Affairs and Forestry,Australian Blackwood (Acacia melanoxylon) was actively introduced into the indigenous forests of the southern Cape until about 1930. On the perception that this exotic species constituted a threat to the indigenous forest, a policy of eradication was followed. This perception... -
Socio-economic impact of ox skidding project to the surrounding villages of Mount Meru forest plantations, Northern Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: W.S. Abeli --- Faculty of Forestry and Nature Conservation, Tanzania J.R. Maximillian --- Faculty of Forestry and Nature Conservation, Tanzania A.E. Kweka --- Faculty of Forestry and Nature Conservation, Tanzania D.T.K. Shemwetta --- Faculty of Forestry and Nature Conservation, TanzaniaThe ox skidding project was initiated with the objective ofusing oxen for transporting logs from the stump sites to the landings. It was supposed to be a participatory research project aimed at integrating scientific knowledge with practical skills and resource... -
Effects of site management operations on the nutrient capital of a eucalypt plantation system in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Ben du Toit --- , South AfricaThe Karklo of Project is a case study ofthe effects ofintensive site management operations during the interrotational period, on (a) the nutrient capital of the system, and (b) the availability of growth resources (nutrients and water) in a commercial Eucalyptus... -
Does soil compaction on harvesting extraction roads affect long-term productivity of Eucalyptus plantations in Zululand, South Africa?
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Colin W. Smith --- ,The effect ofsoil compaction on the growth of Eucalyptusgrandis and two clonal hybrids (Eucalyptus grandis x urophylla (E. gxu) and Eucalyptus grandis x camaldulensis (E. gxc)) was evaluated on harvesting extraction roads at three sites in the Zululand region ofKwaZulu-Natal... -
Survival and growth of Pinus patula at two years in response to harvest residue and pest management, in Mpumalanga, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Carol Rolando --- , Ross Allan --- ,Previous research has indicated that the presence of harvesting residues, post-planting tern perature and rainfall, and insect pests and diseases, are among the main causes of mortality during re-establishment of Pinus patula stands. The main objectives of this work were... -
Effects of temperature on Pinus patula seedlings growing in pots in a controlled environment
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Colleen A. Carlson --- Horticultural Science Department, South Africa Ross Allan --- Shaw Research Centre, South Africa Andrew R. Morris --- Shaw Research Centre, South AfricaThe re-establishment of Pinus patula seedlings into sites with high harvesting residue (slash) loads can negatively affect the survival of these plants. Field trials have examined the role that insect pests and fungal diseases play in causing this phenomenon. Research... -
Harvesting, processing and utilisation of rattan canes in Western Nigeria
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E. Babajide Lucas --- Department of Agricultural Engineering, Nigeria Bamidele I.O. Dahunsi --- Department of Civil Engineering, NigeriaField trips were undertaken as a preliminary exercise, to identify the available rattan species in Western Nigeria and to estimate the quantities available. Information relating to their end-uses was collected from cane furniture makers and other rattan cane users through... -
Pinus saw timber tree optimisation in South Africa: a comparison of mechanised tree optimisation (harvester/processor) versus current manual methods
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: John Eggers --- , South Africa Andrew McEwan --- , South Africa Beatrice Conradie --- , South AfricaBoth Cut to Length (CTL) and Full Tree/Tree Length (FT/TL) ground-based systems are used to harvest pine in South Africa. The fully mechanised CTL system is the most recently introduced system in South Africa. One of the reasons for the... -
Oil yield and quality variation between sexes in Osyris lanceolata (African sandalwood) and its value as a fodder plant in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: PL Mwang’ingo --- Faculty of Science, Tanzania G Kibodya --- Faculty of Science, Tanzania AR Mng’ong’o --- , TanzaniaAfrican sandalwood (Osyris lanceolata) is widely harvested in East Africa for extraction of oil, which is used in the fragrance and perfumery industry. Over the years, harvesting of the species has been concentrated to female plants because it is claimed... -
Improving harvester estimates of bark thickness for radiata pine (Pinus radiata D.Don)
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Strandgard --- CRC Forestry, Australia D Walsh --- CRC Forestry, AustraliaHarvesters estimate bark thickness primarily from diameter over bark (DOB) and use it to estimate log volume and value. Harvester bark thickness estimation errors can reduce returns through poor bucking optimisation and out-of-specification logs. Radiata pine bark thickness data from... -
Fibre volume losses of eight softwood clearfell harvesting systems in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: P Ackerman --- Department of Forest and Wood Science, South Africa R Pulkki --- Department of Forest and Wood Science, South AfricaA study of both fibre volume loss and related opportunity cost was performed across the South African softwood sawtimber industry to gain information on the actual utilisation of useful fibre and potential loss or gain of opportunity in terms of... -
Response of Ocotea bullata, Curtisia dentata and Rapanea melanophloeos to medicinal bark stripping in the southern Cape, South Africa: implications for sustainable use
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: WJ Vermeulen --- Conservation Services, South Africa CJ Geldenhuys --- Department of Forest and Wood Science, South Africa KJ Esler --- Department of Conservation Ecology, South AfricaTree bark is commonly used for traditional medicine in southern Africa and further afield. Increasing demand and commercialisation have resulted in the overexploitation of many species, posing a major challenge to forest managers to develop mechanisms for sustainable resource use... -
Determining the effect of tree size, bark-wood bond strength and tree form on the productivity of an excavator-based harvester in Acacia mearnsii in the KwaZulu-Natal forestry region of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Ramantswana --- , South Africa A McEwan --- , South Africa J Pauw --- , South AfricaThe aim of this study was to determine the effect of tree size, bark-wood bond strength and tree form on the productivity of cut-to-length harvesting of Acacia mearnsii, using an excavator-based harvester with a SP Maskiner harvester head in the... -
Machine productivity and residual harvesting residues associated with a cut-to-length harvest system in southern Tasmania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MR Ghaffariyan --- , Australia J Sessions --- Department of Forest Engineering, Resources and Management, USA M Brown --- Office of PVC Research, AustraliaThe cut-to-length method is a preferred method for harvest of pine plantations in Australia. The cut-to-length method studied in southern Tasmania consists of a feller-buncher, processor, forwarder, grapple loader and tractortrailers that were producing only pulp logs for the plantation... -
A comparison between excavator-based harvester productivity in coppiced and planted Eucalyptus grandis compartments in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Muedanyi Ramantswana --- Nelson Mandela Metropolitan University, South Africa Andrew McEwan --- Nelson Mandela Metropolitan University, South Africa Jaap Steenkamp --- Nelson Mandela Metropolitan University, South AfricaDue to the labour challenges in South Africa, mechanised forestry equipment has increasingly been required to operate in complex forest conditions – such as coppiced Eucalyptus compartments – where they have not operated before. For this reason, harvesters are either... -
Mangrove litter production and organic carbon pools in the Mngazana Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Anusha Rajkaran JanineB AdamsWood harvesting is reducing the density of adult mangrove trees in the Mngazana Estuary. This is expected to decrease the amount of litter produced as well as the availability of organic carbon to the estuary and the nearshore environment. Pools... -
Juncus kraussii harvesting in Umlalazi Nature Reserve, KwaZulu-Natal, South Africa: socio-economic aspects and sustainability
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CatherineH TraynorHarvesting of the rush Juncus kraussii Hochst. for use as a fibre source in craftwork production was investigated within Umlalazi Nature Reserve in KwaZulu-Natal Province, South Africa. The main objectives of the study were as follows: to determine the distribution... -
Toward sustainable harvesting of Africa's largest medicinal plant export (Prunus africana): a case study in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JR Maximillian --- College of Natural Resources, USA J O'Laughlin --- College of Natural Resources, USAGlobal demand for treating prostate disorders with Prunus africana bark extract has made P. africana Africa's largest medicinal plant export. Unsustainable harvesting practices can lead to local extirpations of this multipurpose tree. Survey research targeting P. africana harvesters in a... -
Productivity and cost analysis of semi-mechanised and mechanised systems on the Viphya forest plantations in Malawi
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Elisha Ngulube --- Forest Postgraduate Programme, Plant Sciences Complex, South Africa Michal Brink --- Forest Postgraduate Programme, Plant Sciences Complex, South Africa Paxie W Chirwa --- Forest Postgraduate Programme, Plant Sciences Complex, South AfricaAt least 200 000 m3 of timber is harvested annually using semi-mechanised harvesting systems on the Viphya forest plantations in Malawi. Although these systems have long been used on the Viphya, no investigation on their productivity has so far been... -
Marine reserve effects on population density and size structure of commonly and rarely exploited limpets in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MDV Nakin --- Walter Sisulu University, South Africa CD McQuaid --- Coastal Research Group, Department of Zoology and Entomology, South AfricaMarine reserves are commonly used to conserve living resources, but their effectiveness where policing is difficult is unclear. We compared monthly population density and size structure data collected over 20 months for two rarely and two commonly exploited intertidal limpets... -
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... -
Clinical anatomy of the superior cluneal nerve in relation to easily identifiable bony landmarks
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: L Loubser --- Department of Anatomy, South Africa RP Raath --- Jakaranda Pain Clinic, South Africa AN Van Schoor --- Department of Anatomy, South AfricaBackground: Lower back pain (LBP) remains a common ailment among adult populations and a superior cluneal nerve (SCN) entrapment accounts for 10% of reported LBP cases. The diagnostic criteria for SCN entrapment include anaesthesia of the area supplied by the... -
A control system for a poundo yam flour processing plant
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sesan Peter Ayodeji --- Department of Industrial Engineering, South Africa Khubulani Mpofu --- Department of Industrial Engineering, South Africa Oduetse Matsebe --- Department of Industrial Engineering, South Africa Mohammed Olayinka Olabanji --- Department of Industrial Engineering, South AfricaThe use of control systems reduces the need for human involvement in food processing plants, reduces stress in the production process, and makes production more efficient and cleaner. A control system was designed for a poundo yam processing plant using... -
The role of nutrient solution composition on the uptake of nutrients, growth and vase life of tulips grown hydroponically under South African conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Geline Derbyshire --- Department of Agronomy, South Africa Eleanor W Hoffman --- Department of Horticultural Sciences, South Africa Estelle Kempen --- Department of Agronomy, South AfricaAn understanding and optimisation of the key agronomical aspects required for successful hydroponic cultivation of cut tulips in South Africa, a warm production region, is essential to unlock its commercial potential. In this study the effect of nutrient solution composition,... -
Productivity and cost of whole‑tree harvesting without debarking in a Eucalyptus nitens plantation in Tasmania, Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Martin Strandgard --- University of the Sunshine Coast, Australia Damian Walsh --- University of the Sunshine Coast, Australia Rick Mitchell --- University of the Sunshine Coast, AustraliaThere is increasing interest worldwide in using tree harvesting biomass as an energy source. Bark retained on logs is commonly used as an energy source, but is generally removed from eucalypt logs during harvest. In order to evaluate the potential... -
Bald kelp: natural and harvesting-induced frond loss in the South African kelp Ecklonia maxima
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Elston --- Department of Biological Sciences, South Africa RJ Anderson --- Department of Biological Sciences, South Africa LM Price --- Department of Biological Sciences, South AfricaEcklonia maxima dominates kelp beds on the west coast of southern Africa, and is commercially and ecologically valuable. Some plants lose all their secondary blades (fronds), leaving only the gas-filled bulb and short primary blade at the top of the... -
Antioxidant content and phytochemical properties of apple ‘Granny Smith’ at different harvest times
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Asanda Mditshwa --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Sciences, Faculty of AgriSciences, South Africa Filicity Vries --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa Kobus van der Merwe --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa Elke Crouch --- Department of Horticultural Sciences, Faculty of AgriSciences, South Africa Umezuruike Linus Opara --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Sciences, Faculty of AgriSciences, South AfricaUnderstanding the biochemical composition of fruit to be stored could be used as a tool for planning postharvest management to maintain quality and reduce losses of fresh fruit. This study evaluated the effects of harvesting fruit seven days before (H1)... -
Integrated harvesting for conventional log and energy wood assortments: a case study in a pine plantation in Western Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Mohammad R Ghaffariyan --- Australian Forest Operations Research Alliance (AFORA), University of the Sunshine Coast, Australia Raffaele Spinelli --- CNR-IVALSA, Italy Natascia Magagnotti --- CNR-IVALSA, Italy Mark Brown --- Australian Forest Operations Research Alliance (AFORA), University of the Sunshine Coast, AustraliaBiomass or energy wood harvesting can be integrated with conventional log harvesting (saw log or pulpwood production) to allow more cost-effective energy wood supply. The efficiency of an integrated energy wood harvesting system was evaluated and compared with conventional log... -
Operator work-related musculoskeletal disorders during forwarding operations in South Africa: an ergonomic assessment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kudakwashe Phairah --- Department of Plant Production and Soil Science, Forest Science Postgraduate Programme, South Africa Michal Brink --- Department of Plant Production and Soil Science, Forest Science Postgraduate Programme, South Africa Paxie Chirwa --- Department of Plant Production and Soil Science, Forest Science Postgraduate Programme, South Africa Andrew Todd --- Department of Human Kinetics and Ergonomics, South AfricaForest machine operators are still experiencing work-related musculoskeletal disorders (WMSDs) despite extensive mechanisation and modernisation of harvesting systems. However, paucity of local ergonomics research and technology transfer problems may affect the use of mechanised systems in South Africa. Consequently, this... -
Cost-productivity analysis of South African pine sawtimber mechanised cut-to-length harvesting
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Chloe Williams --- Department of Forest and Wood Science, South Africa Pierre Ackerman --- Department of Forest and Wood Science, South AfricaThe South African forestry industry is experiencing an increase in the number of fully mechanised timber-harvesting systems. Understanding the productivity of these systems, for which data is currently limited for South Africa, is an important step to maximise the utilisation... -
Decision-support tool for management of miombo woodlands: a matrix model approach
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Wilson A Mugasha --- Department of Ecology and Natural Resource Management, Norway Ole M Bollandsås --- Department of Ecology and Natural Resource Management, Norway Terje Gobakken --- Department of Ecology and Natural Resource Management, Norway Eliakimu Zahabu --- Department of Forest Mensuration and Management, Tanzania Josiah Z Katani --- Department of Forest Mensuration and Management, Tanzania Tron Eid --- Department of Ecology and Natural Resource Management, NorwayRational forest management planning requires information on the present forest state and on future development. However, forest management planning in Tanzania has often been done without any information on forest development because appropriate tools are lacking. This study presents a... -
Use of volatile oils of garlic to control the cowpea weevil Callosobruchus maculatus (Bruchidae: Coleoptera)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mahgoub I Abdalla --- Department of Crop Science, Faculty of Natural Resources and Environmental Studies, Sudan Azhari O Abdelbagi --- Department of Crop Protection, Faculty of Agriculture, Sudan Ahmed MA Hammad --- Department of Crop Protection, Faculty of Agriculture, Sudan Mark D Laing --- Discipline of Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South AfricaCowpea weevil causes losses of 50–90% in cowpea after harvest. Control has relied on toxic agrochemical fumigants that are no longer available or are dangerous and relatively expensive, making its control difficult for most farmers. This study was initiated to... -
Bark removal for medicinal use predisposes indigenous forest trees to wood degradation in Zambia
Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal • Authors: D Chungu A Muimba-Kankolongo J Roux FM MalamboBark harvesting for medicinal purposes has become widespread in Zambia, mainly due to the high levels of poverty among the population. The injury caused to trees leads to wood deterioration as a result of insect damage and fungal infection. This... -
Phylogeny of the Sepia officinalis species complex in the eastern Atlantic extends the known distribution of Sepia vermiculata across the Benguela upwelling region
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJE Healey --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales NJ McKeown --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Wales WM Potts --- Department of Ichthyology and Fisheries Science, South Africa CL de Beer --- Department of Ichthyology and Fisheries Science, South Africa W Sauer --- Department of Ichthyology and Fisheries Science, South Africa PW Shaw --- Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, WalesAccurate species identification and biogeographic characterisation are fundamental for appropriate management of expanding cephalopod fisheries. This study addresses this topic within the common cuttlefish Sepia officinalis species complex (S. officinalis, S. hierredda and S. vermiculata), with an emphasis on occurrence... -
Amaranth grain production as affected by watering regimes and day length in southern Mozambique
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jerónimo EMM Ribeiro --- Department of Agronomy, South Africa Petrus J Pieterse --- Department of Agronomy, South Africa Sebastião I Famba --- Faculty of Agronomy and Forestry Engineering, MozambiqueThe high nutritional value of amaranth grain makes it attractive for the diet of rural people living in dry semi-arid areas of southern Mozambique. A study was implemented with Amaranthus hybridus and A. tricolor in sandy soil aiming to assess... -
Harvesting and extraction impacts on Eucalyptus grandis × E. urophylla coppicing potential and rotation-end volume in Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kylle Schwegman --- Nelson Mandela Metropolitan University, South Africa Keith M Little --- Nelson Mandela Metropolitan University, South Africa Andrew McEwan --- Nelson Mandela Metropolitan University, South Africa Simon A Ackerman --- Institute for Commercial Forestry Research, South AfricaFrom the early 2000s there has been a general shift in South Africa in harvesting and extraction systems from the use of semi- to fully-mechanised systems. Any increase in mechanisation, as is occurring in Zululand, will need to take into... -
The impact of log surface damage caused by harvester Eucalyptus debarking on pulp value recovery
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jaco-Pierre van der Merwe --- Department of Forest and Wood Science, South Africa Reino Pulkki --- Department of Forest and Wood Science, South Africa Pierre Ackerman --- Department of Forest and Wood Science, South Africa Dirk Längin --- Mondi Ltd, South AfricaMechanised harvesting operations are growing in popularity in South Africa, as motor-manual and manual harvesting operations pose significant health and safety risks to workers. Potential damage inflicted by single-grip harvester feed rollers and delimbing knives on the log surface during... -
Impact of number of stems per stool on mechanical harvesting of a Eucalyptus globulus coppiced plantation in south-west Western Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Martin Strandgard --- Australian Forest Operations Research Alliance (AFORA), Australia Rick Mitchell --- Australian Forest Operations Research Alliance (AFORA), AustraliaCoppice regeneration of eucalypt plantations is increasingly being used in Australia to reduce re-establishment costs. However, little is known about the impact of early coppice reduction regimes on harvester performance during clearfelling. The trial compared the productivity, time consumption, cost... -
A productivity model for first thinning of Pinus patula using a tractor and double-drum winch in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Thabo Moloi --- Forest Postgraduate Programme, South Africa Michal Brink --- Forest Postgraduate Programme, South Africa Paxie W Chirwa --- Forest Postgraduate Programme, South Africa Elisha Ngulube --- Department of Forestry, MalawiThe productivity of skidding tractors in intermediate harvesting operations has not been determined in Mpumalanga, South Africa. The objective of this study was to develop a productivity model using a farm tractor in first thinning operations in Pinus patula compartments... -
Analysis of phenotypic variability for yield and quality traits within a collection of cassava (Manihot esculenta) genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Athanase Nduwumuremyi --- African Centre for Crop Improvement, South Africa Rob Melis --- African Centre for Crop Improvement, South Africa Paul Shanahan --- African Centre for Crop Improvement, South Africa Asiimwe Theodore --- Rwanda Agriculture Board, RwandaGenetic diversity is essential for crop improvement and knowledge of the genetic variability within a breeding population facilitates its future exploitation. This study examined the phenotypic and genetic variability for specific cassava key traits in a collection of 30 genotypes... -
Carbon stocks and productivity of mangrove forests in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marco A Njana --- National Carbon Monitoring Centre, Tanzania Eliakimu Zahabu --- National Carbon Monitoring Centre, Tanzania Rogers E Malimbwi --- Department of Forest Mensuration and Management, TanzaniaMangroves offer a number of ecosystem goods and services, including carbon (C) storage. As a carbon pool, mangroves could be a source of CO2 emissions as a result of human activities such as deforestation and forest degradation. Conversely, mangroves may... -
Pre-harvest Curing: Effects on Skin Adhesion, Chemical Composition and Shelf-life of Sweetpotato Roots under Tropical Conditions
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: Aditya Parmar --- Department of Agricultural and Biosystems Engineering, Germany Sascha M. Kirchner --- Department of Agricultural and Biosystems Engineering, Germany Barbara Sturm --- Department of Agricultural and Biosystems Engineering, Germany Oliver Hensel --- Department of Agricultural and Biosystems Engineering, GermanyExcoriation (skinning injury) is a serious post-harvest problem for sweetpotato roots. In industrialized countries, sweetpotatoes are exposed to post-harvest curing to facilitate skin toughening and wound healing. However, in developing regions, such a practice is barely undertaken. Pre-harvest curing (PHC),... -
Performance of Drought Tolerant Maize Varieties under Water Harvesting Technologies in the Coastal Region of Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: M.B. Muli --- Kenya Agricultural and Livestock Research Organization, Kenya D. Kengo --- Kenya Agricultural and Livestock Research Organization, Kenya A. Mzingirwa --- Kenya Agricultural and Livestock Research Organization, Kenya R. Musila --- Kenya Agricultural and Livestock Research Organization, KenyaThe average annual rainfall in coastal Kenya is 450–700 mm per annum in most places while the total annual evapotranspiration is 1200–1800 mm. In arid and semi-arid lands (ASALs), farmers grow maize varieties for medium to high rainfall zones without considering the... -
Assessment of consumer preference traits of indigenous sheep type and market channels in Bensa District, Southern Ethiopia
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: H Kenfo --- Southern Agricultural Research Institute, Ethiopia Y Mekasha --- International Livestock Research Institute, Ethiopia Y Tadesse --- Haramaya University, EthiopiaThis study was carried out in Bensa district of Sidama Zone, southern Ethiopia. The objective of this study was to assess consumer preference traits of indigenous sheep type in the study area. Data were analysed using SPSS versions 16. There... -
Effect of residue management and fertiliser application on the productivity of a Eucalyptus hybrid and Acacia mangium planted on sloping terrain in northern Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nguyen Van Bich --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Daniel Mendham --- CSIRO Land and Water, Australia Katherine J Evans --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Tran Lam Dong --- Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam Vo Dai Hai --- Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam Hoang Van Thanh --- Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam Caroline L Mohammed --- Tasmanian Institute of Agriculture, University of Tasmania, AustraliaForest plantation growers in Vietnam commonly burn residues after harvesting and often apply suboptimal amounts of nutrients during plantation establishment. We examined whether the retention of forest residue, and application of phosphorus fertiliser at higher rates, can increase rates of... -
Impact of land use on woody aboveground biomass in Miombo woodlands of western Zambia – comparison of three allometric equations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Priscilla Sichone --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Ute Schmiedel --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Jens Oldeland --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Norbert Jürgens --- Institute for Plant Science and Microbiology, University of Hamburg, GermanyGlobally, the intensification of land use for agriculture, timber and fuel is considered the leading threat to the diversity and biomass of forests and woodlands. To suggest management options, it is important to understand the patterns and drivers of diversity,... -
Spatial distribution, seasonal abundance and exploitation status of shark species in Kenyan coastal waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BK Kiilu --- Kenya Fisheries Services, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya RM Oddenyo --- Coral Reef Conservation Project, Kenya P Thoya --- Kenya Marine and Fisheries Research Institute, Kenya JM Njiru --- Kenya Marine and Fisheries Research Institute, KenyaEfforts to conserve and manage shark populations are often hampered by a lack of basic data, such as species-specific landings and distribution ranges. We bridge this gap in coastal East Africa by providing data on the distributions, catch rates, morphometrics,... -
Determinants and causes of postharvest milk losses among milk producers in Nyandarua North subcounty, Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: MM Ndungu --- Kenya Agricultural and Livestock Research Organization (KALRO) Dairy Research Centre, Kenya JK Lagat --- Egerton University, Kenya JK Langat --- Egerton University, KenyaNyandarua County has enormous milk production potential and has a large amount of milk, because of large a population of dairy cows coupled with the huge milk market demand from within and without. Despite this potential, milk postharvest losses have... -
Promoting rainwater harvesting for improving water security: Analysis of drivers and barriers in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mavis Akuffobea-Essilfie --- , Ghana Portia Adade Williams --- , Ghana Roland Asare --- , Ghana Sigrid Damman --- , Norway George Owusu Essegbey --- , GhanaThe study explored strategies and means of achieving wider acceptability and adoption of roof rainwater harvesting (RWH) systems in Ghana to improve water security and availability. The paper employed a qualitative approach in analyzing views expressed by a wide range... -
Effect of harvest residue management on soil properties of Eucalyptus hybrid and Acacia mangium plantations planted on steep slopes in northern Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nguyen Van Bich --- , Australia Alieta Eyles --- , Vietnam Daniel Mendham --- , Australia Tran Lam Dong --- , Vietnam Katherine J. Evans --- , Australia Vo Dai Hai --- , Vietnam Caroline Mohammed --- , AustraliaBurning harvest residues during site preparation can compromise the soil-nutrient stock in short-rotation plantations, but this practice remains common in northern Vietnam. This study compared the effect of two contrasting harvest-residue treatments (burning vs retention) on soil total carbon (TC),... -
Biomass-based value chain analysis of plantain in two regions in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Charles Tortoe --- , Ghana Wilhelmina Quaye --- , Ghana Paa Toah Akonor --- , Ghana Charlotte Oduro Yeboah --- , Ghana Evelyn Serwah Buckman --- , Ghana Nana Yamoah Asafu-Adjaye --- , GhanaPlantain biomass value chain analysis was conducted to generate benchmark information that supports reduction of post-harvest losses of plantain and to identify value-added opportunities and linkages to new markets in Ghana. Specifically, this study sought to identify the actors and... -
Rural community use and perception of rangeland products in Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Lwandiso Mdiya --- , South Africa Amon Taruvinga --- , South Africa Abbyssinia Mushunje --- , South Africa Keletso Mopipi --- , South Africa Saul Ngarava --- , South AfricaThe significance of rangelands to the welfare of the rural poor has been acknowledged. The study explores perceptions and determinants of rural households’ rangeland harvesting. A cross-sectional survey of 159 rural households harvesting communal rangeland products was utilized, as well... -
Machine learning techniques to estimate mechanised forest cutting productivity
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Saulo Boldrini Gonçalves --- , Brazil Nilton Cesar Fiedler --- , Brazil Jeferson Pereira Martins Silva --- , Brazil Gilson Fernandes da Silva --- , Brazil Mayra Luiza Marques da Silva --- , Brazil Luciano José Minette --- , Brazil Daniel Pena Pereira --- , Brazil Domingos Manuel Mendes Lopes --- , Portugal Evandro Ferreira da Silva --- , Brazil Antônio Henrique Cordeiro Ramalho --- , Brazil Jeangelis Silva Santos --- , Brazil Marcelo Otone Aguiar --- , Brazil Jose de Oliveira Melo Neto --- , Brazil Renisson Neponuceno de Araújo Filho --- , BrazilThe productivity of wood harvesting operations is one of the main viability indicators of the forestry enterprise, which is directly influenced by land, population, and operational planning characteristics. The variables that affect the productivity of harvesting machines are particularly difficult... -
Impact of preceding crop sequences on wheat growth and development under conservation agriculture in the eastern Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MH Visser --- , South Africa A Barnard --- , South Africa CC du Preez --- , South AfricaConservation agriculture (CA) is advocated to promote sustainable cropping. Little is known about the impact of preceding crop sequences on the growth and development of dryland wheat under CA in the eastern Free State Province of South Africa. In a... -
Influence of water application levels and plant densities on the plasticity of canola in the central Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: KA Seetseng --- , South Africa LD van Rensburg --- , South Africa JH Barnard --- , South Africa CC du Preez --- , South AfricaIn South Africa canola (Brassica napus L.) is cultivated in rotation with wheat under winter rainfall in the Western Cape Province. Expansion of the crop to the other eight provinces is advocated to reduce a shortage of locally produced plant... -
An assessment of postharvest losses to support innovation in the egg value chain in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Evelyn Philomina Mensah --- , Ghana Richard Kwasi Bannor --- , Ghana Helena Oppong-Kyeremeh --- , Ghana Samuel Kwabena Chaa Kyire --- , GhanaThe study sought to examine the postharvest losses along the egg value chain in the Bono Region of Ghana. Objectively, the study sought to quantify losses incurred by value-chain actors of egg production, determine the factors that influence the losses... -
Wood extraction performance with a farm tractor in a mountainous region of Brazil: cycle time, productivity and costs of two different work crews
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rafael Oliveira Brown --- , Brazil Kauê Augusto Oliveira-Nascimento --- , Brazil Renato César Gonçalves Robert --- , Brazil Daniel DeArmond --- , BrazilHarvesting is a complex and expensive step within forestry operations. In mountainous terrain timber harvesting is complex due to the risks and limitations that the terrain imposes on traditional forms of wood extraction. The objective of this study was to... -
Gradual increase in the intensity of machine traffic in timber harvesting: effects on soil composition and functionality
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Miriam Fernanda Rodrigues --- , Brazil Diego Rodrigues --- , Brazil André Pellegrini --- , Brazil Elisandra Pocojeski --- , BrazilThis study describes the effects of gradually increasing the intensity of machine traffic in timber harvesting of Pinus taeda L. in a cut-to-length system on the severity of compaction and changes in functionality of a subtropical Oxisol in southern Brazil... -
Farmers’ knowledge, attitudes, and perceptions for the adoption of in-field rainwater harvesting (IRWH) technique in Thaba Nchu, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Admire Rukudzo Dzvene --- , South Africa Weldemichael Tesfuhuney --- , South Africa Sue Walker --- , South Africa Andries Fourie --- , South Africa Cobus Botha --- , South Africa Gert Ceronio --- , South AfricaA systematic engagement strategy was used to identify contextual factors that prevent farmers from accepting the in-field rainwater harvesting (IRWH) technique. The purpose of the qualitative study is to assess farmers’ knowledge and attitudes about the technique, as well as... -
Preliminary study on improved postharvest practices for tomato loss reduction in Nigeria, Rwanda and India
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Olubukola Motunrayo Odeyemi --- , Nigeria Lisa Kitinoja --- , USA Neeru Dubey --- , India Solange Musanase --- , Rwanda Gurbinder Singh Gill --- , USATomato production is increasing along with postharvest losses in Nigeria, Rwanda and India. Modified Commodity Systems Assessment Methodology on tomato was conducted in the study areas during the July – August 2017 harvest season to evaluate the costs and benefits... -
Application of intermittent warming to enhance postharvest quality and extend the shelf life of pomegranate fruit (Punica granatum)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Olaniyi Amos Fawole --- , South Africa Loriane Jennifer Ayo-ola Yanclo --- , South Africa Umezuruike Linus Opara --- , South AfricaIntermittent warming (IW) cycles slow down the physiology of fresh horticultural commodities, thereby extending their storage life. We investigated the effects of IW on physiological disorders, physicochemical, sensory parameters and the emission of volatile organic compounds (VOCs) of pomegranate (Punica... -
Relationships between spacing, productivity and profitability of eucalypt plantations in a small rural property in south-eastern Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gabriel Soares Lopes Gomes --- Universidade Federal do Espírito Santo, Brazil Sílvio Nolasco de Oliveira Neto --- Universidade Federal de Viçosa, Brazil Helio Garcia Leite --- Universidade Federal de Viçosa, Brazil Márcio Lopes da Silva --- Universidade Federal de Viçosa, Brazil Lucas Sérgio de Sousa Lopes --- Universidade Federal de Viçosa, Brazil Bruno Leão Said Schettini --- Universidade Federal de Viçosa, BrazilTree cultivation spacing can influence productivity and wood quality, with silvicultural, technological and economic implications. This study aimed to estimate the production and provide an economic analysis of Eucalyptus urophylla × Eucalyptus grandis stands as a function of planting spacing... -
Plantation water productivity (PWPWOOD) and not water-use efficiency (WUE) as the measure of commercial plantation yield improvement: a review
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nkosinathi D Kaptein --- University of KwaZulu-Natal, South Africa Alistair D Clulow --- University of KwaZulu-Natal, South Africa Michele Toucher --- University of KwaZulu-Natal, South Africa Colin S Everson --- University of KwaZulu-Natal, South Africa Steven B Dovey --- Shaw Research Institute, South Africa Ilaria Germishuizen --- Institute for Commercial Forestry Research, South AfricaGlobal demand for forest products is ever-increasing, creating competition for water between downstream water users and commercial forest producers. Tree production should therefore aim at the effective use of water by producing maximum tree biomass from water used with the... -
Forage yield and quality response of Napier grass (Cenchrus purpureus) to different dry season harvesting management under the subhumid agroecology of western Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Abuye Tulu --- Oromia Agricultural Research Institute, Ethiopia Mekonnen Diribsa --- Oromia Agricultural Research Institute, Ethiopia Worku Temesgen --- Oromia Agricultural Research Institute, EthiopiaA 3 × 2 factorial study was conducted in 2015, 2016 and 2017, to assess the impact of dry season cutting management on fodder yield and quality of Napier grass. Three harvesting times (November, January and March) and two stubble-... -
Rainfed-based production of Megathyrsus maximus in sub-Saharan Africa: the case of the semi-arid environment of Sudan
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hussein I Mohamed --- , Sudan Shamseddin M Ahmed --- Water Management and Irrigation Institute, University of Gezira, Sudan Adil D Mohamed --- Water Management and Irrigation Institute, University of Gezira, SudanThe performance of rainfed-based Megathyrsus maximus (syn. Urochloa maxima and Panicum maximum) was investigated in the semi-arid pastures of Sudan. Split-plot complete design experiments with three replications were applied for two consecutive seasons (2020–2021). The treatments were two in situ... -
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... -
Effect of rotational harvesting on the size composition of Cape rock oysters Striostrea margaritacea on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- Oceanographic Research Institute, South Africa JC Groeneveld --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fishery Science, Uit – The Arctic University of Norway, NorwayA commercial fishery for the Cape rock oyster Striostrea margaritacea along the north coast of KwaZulu-Natal, South Africa (western Indian Ocean), follows a 4-year rotational cycle, with each harvest year followed by 3 fallow years across four harvest zones. We... -
Effect of plant spacing and cutting intensity on the morphology and productivity of forage cactus [Opuntia stricta (Haw.) Haw.]
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Claudia Maciel Ferreira --- Universidade Federal Rural de Pernambuco, Brazil Marcio Vieira da Cunha --- Universidade Federal Rural de Pernambuco, Brazil Mércia Virginia Ferreira dos Santos --- Universidade Federal Rural de Pernambuco, Brazil Alexandre Carneiro Leão de Mello --- Universidade Federal Rural de Pernambuco, Brazil Djalma Cordeiro dos Santos --- Instituto Agronômico de Pernambuco, Brazil Maria da Conceição Silva --- Instituto Agronômico de Pernambuco, Brazil Janerson José Coelho --- Universidade Federal Rural de Pernambuco, BrazilThe forage cactus cultivar Mexican elephant ear (MEE) [Opuntia stricta (Haw.) Haw.] has been widely used in the semi-arid of Brazil because of its resistance to carmine mealybug. Therefore, it is necessary to establish planting and harvesting management strategies for... -
Impact of postharvest handling technologies on income of tomato (Solanum Lycopersicum L.) smallholder farmers in Mvomero, Morogoro, Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Robert Geofrey --- Mzumbe University, Tanzania Eliaza Mkuna --- Mzumbe University, Tanzania Nyamsabhi M. Nyamwero --- Mzumbe University, Tanzania Kulwa Mang’ana --- Nelson Mandela African Institute of Science and Technology (NM-AIST), TanzaniaThis study investigates how smallholder tomato farmers in Mvomero District, Tanzania, utilize postharvest handling technologies (PHTs) and analyzes the factors influencing their adoption. We also assess the impact of PHTs on farmer income. Using a cross-sectional survey of 201 farmers,... -
Eunicid polychaete worms used as bait with particular reference to Australia, South Africa and France; the need for development of management plans based on their biology and ecology
Item type: Journal Article • Journal: African Zoology • Authors: Pat Hutchings --- Australian Museum Research Institute, Australia Jyothi Kara --- , South Africa Nicolas Lavesque --- CNRS, Université de Bordeaux, Bordeaux INP, EPOC,Worldwide, bait worms are collected for recreational and subsistence fishing, and fetch high prices in bait shops. While a variety of polychaete families are collected, we focus only on the “Marphysa” group (Family Eunicidae) occurring in rivers, estuaries and protected... -
Quality characteristics of forage in the sowing year of a standard perennial pasture established with annual ryegrass, barley, and berseem clover as companion crops
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hasan Beytullah Dönmez --- Çukurova University, Turkey Rustu Hatipoglu --- Kırşehir Ahi Evran University, TurkeyThis study was conducted to determine the effect of different seed sowing rates (25%, 50%, 75%, 100% of the recommended pure stand of the species) and harvesting stages (early harvest, late harvest) of annual ryegrass, barley, and berseem clover used... -
Individual differences in technological readiness and the adoption of solar dryers: The case of horticultural smallholder farmers in Northern Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Dismas Jerome Kimaro --- Nelson Mandela African Institution of Science and Technology (NM-AIST), Tanzania Thomas Kivevele --- Nelson Mandela African Institution of Science and Technology (NM-AIST), Tanzania Anthony Nyangarika --- Nelson Mandela African Institution of Science and Technology (NM-AIST), TanzaniaAdoption of solar dryers among smallholder farmers in developing countries remains low, despite their proven potential to enhance food security. While prior studies emphasize techno-socio-economic barriers, they often overlook individual psychological traits that likely shape adoption behaviour, assuming uniform adoption...