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Invloed van sekere grondeienskappe op matrikspotensiaal by, en tydsverloop tot, veldkapasiteit
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Hoëveldstreek, Departement van Landbou,Veldkapasiteit (VK) is bepaal op 5x5 m-persele op verskeie gronde in Wes-Kaapland. Tekstureel het die gronde gewissel van growwe sand tot sandklei. Gronde van die Avalon-, Dundee-, Fernwood-, Hutton-, Oakleafen Westleighvorme is gebruik. Matrikspotensiaal (ψm) is gemonitor met kwiktensiometers, terwyl... -
Effect of exchangeable sodium and phosphogypsum on the hydraulic properties of several South African soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.M. du Plessis --- , I. Shainberg --- ,The susceptibility of soils to the deleterious effects of sodicity was assessed for samples which varied with respect to physical, mineralogical and other properties. For this purpose soil samples were collected from different locations in South Africa. The effect of... -
'n Vergelyking tussen berekende en in situ onversadigde geleivermoë van 'n sand en 'n sandkleileem
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaOnversadigde geleivermoë, K(θ), is bereken vanaf verskeie vergelykings gebaseer op poriegrootteverspreiding en die grondwaterretensiekromme. Versadigde geleivermoë (Ks ) is as passingsfaktor gebruik en is verkry vanaf laboratorium-en veldbepalings. Berekende K(θ) is by verskillende porieklasse vergelyk met waardes vanaf in situ-... -
'n Vergelyking tussen hidrouliese geleivermoë en vernante eienskappe van 'n fynsand en 'n fynsandkleileem tydens in sity-dreinering
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaIn situ-dreineringstudies is in triplikaat op elk van 'n fynsand (Shashaserie) en 'n fynsandkleileem (Msingaserie) uitgevoer. Die ondersoek het 340 uur geduur waartydens op vyf dieptes metings van volumetriese waterinhoud (θ) en matrikspotensiaal (ψm) gedoen is. Unieke verwantskappe tussen θ,... -
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... -
An evaluation of simplified field methods used for estimating soil hydraulic conductivity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.D. Fuller --- , Republic of South Africa J.H. Moolman --- Department of Soil Science, Republic of South AfricaHydraulic properties of three soils from the western Cape and two from the eastern Cape were studied. Water content (θ) data, obtained during drainage of field plots were used to estimate soil hydraulic conductivity [K(θ)] using five methods based on... -
Protein synthesis during osmotic stress in maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.R. Woodward --- , Republic of South Africa A. van der Mescht --- , Republic of South AfricaAn experiment measuring cell membrane stability was conducted on different inbred lines of maize with known drought sensitivity or tolerance. SDS-polyacrylamide gel electrophoresis showed that a 29.5 kD polypeptide was newly synthesized in the drought sensitive inbred line F2834T in... -
The effect of hydroxide solutions on the structural stability and saturated hydraulic conductivity of four tropical soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Nyamangara --- Department of Soil Science and Agricultural Engineering, Zimbabwe S. Munotengwa --- Department of Soil Science and Agricultural Engineering, Zimbabwe P. Nyamugafata --- Department of Soil Science and Agricultural Engineering, Zimbabwe G. Nyamadzawo --- Department of Soil Science and Agricultural Engineering, ZimbabweIndustrial and domestic effluents are widely applied to soil as a way of dumping, and/or source of nutrients and water for plant growth. The potential effects of sodium hydroxide (NaOH) and potassium hydroxide (KOH), which are common hydroxides found in... -
Wheat (Triticum aestivum L.) growth and yield response to saline irrigation water under controlled conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.B. Dikgwatlhe --- , South Africa G.M. Ceronio --- , South Africa L.D. van Rensburg --- , South AfricaSerious agronomic problems occur where saline water is used for irrigation. The effect of irrigation water salinity on wheat was investigated using electrical conductivity (ECi, mS m−1) as a salinity indicator. A pot experiment was conducted at the University of... -
Infiltrability in soils from south-western Africa: effects of texture, electrical conductivity and exchangeable sodium percentage
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.V. Medinski --- Department of Soil Science, South Africa A.J. Mills --- Department of Soil Science, South Africa M.V. Fey --- , Western AustraliaThe effects of particle size, electrical conductivity (EC) and exchangeable sodium percentage (ESP) on infiltra-bility were investigated in 35 soils from Namibia and western South Africa. Samples were grouped as follows: sand (5–9% clay + silt), loamy sand (16–20%) and... -
Early establishment performance of local and hybrid maize under two water stress regimes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Mabhaudhi --- , Pietermaritzburg A.T. Modi --- , PietermaritzburgMaize (Zea mays L.) is the major grain crop in South Africa where most subsistence farmers still plant landraces. The objective of this study was to compare two landrace selections of maize with two hybrids popular among small-scale farmers in... -
Evaluation of electrical conductivity of the fertiliser solution on growth and flowering of a Cymbidium hybrid
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: SK Naik --- , India D Barman --- , India Rampal --- , India RP Medhi --- , IndiaThe effects of three fertiliser solutions (20:20:20, 15:5:25 and 12:30:10 NPK) with electrical conductivity (EC) of 1, 1.5 or 2 mS cm−1 on growth and flowering of Cymbidium ‘Sleeping Nymph’ were investigated over three years. One-year-old tissue-cultured propagules of ‘Sleeping... -
Pitfalls in the Presentation of Chemical Data
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J.A. Day --- Zoology Dept, South AfricaBiologists in the aquatic sciences are often guilty of numerous errors in the presentation of their chemical data. This paper reviews the use of units in the representation of the inorganic constituents of aquatic solutions for their benefit. It explains... -
INFLUENCE OF FRESHWATER FLOW REGIME ON FISH ASSEMBLAGES IN THE GREAT FISH RIVER AND ESTUARY
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: L.D. Ter Morshuizen --- , South Africa A.K. Whitfield --- , South Africa A.W. Paterson --- , South AfricaTwo and a half years of data were collected from the lower Great Fish River, head region and estuary to determine the fish species composition within these areas. Gilchristella aestuaria, Liza dumerilii, Rhabdosargus holubi and Pomadasys commersonnii were the four... -
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... -
Comparisons between laboratory and field results of frost tolerance of pines from the southern USA and Mesoamerica planted as exotics
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GR Hodge --- Department of Forestry and Natural Resources, USA WS Dvorak --- Department of Forestry and Natural Resources, USA ME Tighe --- Department of Forestry and Natural Resources, USAAn artificial freezing study was conducted with 14 pine species and varieties from Mexico and Central America, and the southern and western USA. The pines chosen represented major commercial plantation species in the Southern Hemisphere such as Pinus caribaea var... -
Geology and groundwater regions to quantify primary salinity, sodicity and alkalinity in South African soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Johannes P Nell --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Science, South AfricaAlthough anthropogenic salinisation and sodification has been researched extensively, little is known about the primary salinity in South Africa. This paper therefore aimed to determine the primary salinity, sodicity and alkalinity conditions for South African soils, based on geological units... -
Seed quality characteristics of a bambara groundnut (Vigna subterranea L.) landrace differing in seed coat colour
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tendai P Chibarabada --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Albert T Modi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Tafadzwanashe Mabhaudhi --- Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaBambara groundnut (Vigna subterranea L.) is an underutilised African legume that fits the same ecological niche as Arachis hypogea. It is still cultivated using landraces and little is known about their seed quality. The current study evaluated seed quality characteristics... -
Determining input values for a simple parametric model to estimate evaporation from vineyard soils with special reference to clay content and trellis system
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Philip A Myburgh --- Agricultural Research Council Infruitec-Nietvoorbij, South AfricaEstimating soil evaporation (Es) is an important part of modelling vineyard evapotranspiration for irrigation purposes. Furthermore, quantification of possible soil texture and trellis effects is essential. Daily Es from six topsoils packed into lysimeters was measured under grapevines on slanting... -
In situ evaluation of internal drainage in duplex soils of the Tukulu, Sepane and Swartland forms
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sabelo SW Mavimbela --- Department of Soil, Crop and Climate Sciences, South Africa Leon D van Rensburg --- Department of Soil, Crop and Climate Sciences, South AfricaInternal drainage is a critical hydrological process in soil water conservation. Pedological and physical properties of the South African Tukulu, Sepane and Swartland soil types were studied in respect to soil water storage and hydraulic characteristics during internal drainage. Soil... -
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... -
Population fluctuations of Cerithidea decollata (Gastropoda: Potamididae) in mangrove habitats of the St Lucia Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JL Raw --- , South Africa GM Rishworth --- , South Africa R Perissinotto --- , South Africa JB Adams --- , South AfricaMangrove macrobenthos species are used as ecological indicators as they are sensitive to changes in sediment properties. In this study, the population density of the common mangrove whelk Cerithidea decollata was assessed during different environmental conditions in the St Lucia... -
Assessment of subsurface riverbed clogging by fine sediments in a semi-arid catchment of north-western Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Bendaoud --- , Algeria KA Haddou --- , Algeria AM Taleb --- , Algeria NO Belaidi --- , AlgeriaIn semi-arid regions, natural and anthropogenic disturbances increase the input of fine particles and their subsequent accumulation in streambeds sediment. The clogging of streambeds sediment is caused by the infiltration of fine particles at depth, reducing hydraulic conductivity (K) and... -
Effects of fragmented mangroves on macrozoobenthos: a case study of mangrove clearance for powerline right-of-way at Oproama Creek, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Zabbey --- , Nigeria IG Ekpenyong --- , Nigeria GN Nwipie --- , Nigeria IC Davies --- , Nigeria K Sam --- , NigeriaMangroves are vulnerable to varying magnitudes of degrading impact by human activities. Despite the many benefits of mangrove ecosystems, mangroves in the Niger Delta region are often cleared for electric powerline and oil pipeline rights-of-way, recreation, road construction, housing and... -
Some physical properties of a sandy clay loam humic soil under native forest and sugarcane in northern KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- School of Agricultural, South Africa --- School of Agricultural, South Africa --- School of Agricultural, South AfricaThe conversion of native forest land to commercial farming can have profound effects on soil physical properties. This study compared bulk density (BD), saturated hydraulic conductivity (Ks) and other physical properties of a sandy loam humic soil under native forest... -
Water quality monitoring and measuring physicochemical parameters using wireless sensor networks
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Satyanarayana Murthy --- , India SF Ahamed --- , IndiaIn a world grappling with the dire consequences of poor sanitation and inadequate water conditions, there is an urgent need for a comprehensive solution. The staggering statistics of over 400 million affected cases and 15–25 million lives lost worldwide underscore... -
Comparison of the effectiveness of mined and by-product South African gypsums and other calcium sources for soil sodicity remediation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Marina du Plessis --- Stellenbosch University, South Africa Pieter A Swanepoel --- Stellenbosch University, South Africa Ailsa G Hardie --- Stellenbosch University, South AfricaStudies evaluating the effectiveness of South African gypsum sources are scarce or outdated because of newly introduced products, such as granulated and liquid gypsums. The efficacy of calcium (Ca) nitrate and micro-fine (MF) calcitic limes in comparison to gypsums has... -
Appraisement of groundwater quality status within Enugu, Nigeria, using physicochemical evaluation and water quality indices
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Kelvin Ifeanyi Ekpete --- University of Nigeria, Nigeria Patricia Ebele Igbo --- University of Nigeria, Nigeria Hillary Onyeka Abugu --- University of Nigeria, Nigeria Solomon Obialo Onwuka --- University of Nigeria, Nigeria Nnamdi Lawrence Obasi --- University of Nigeria, Nigeria Chukwuma OB Okoye --- University of Nigeria, NigeriaEnugu state is notorious for potable water scarcity which forces residents to depend on polluted water sources. In this study, an appraisement of the quality status of groundwater from some areas within Enugu was conducted. Physicochemical characteristics of groundwater sampled... -
Assessment of seed quality through rapid tests: a bibliometric analysis
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Carlos Luiz da Silva --- Federal Rural University of Pernambuco, Brazil Marcone Moreira Santos --- Federal Rural University of Pernambuco, Brazil Eliane Cristina Sampaio de Freitas --- Federal Rural University of Pernambuco, Brazil Raquel Maria de Oliveira Pires --- Federal University of Lavras, Brazil Moema Barbosa de Sousa --- Federal Rural University of Pernambuco, Brazil Paulo César da Silva Santos --- Federal Rural University of Pernambuco, Brazil Erika Rayra Lima Nonato --- Federal Rural University of Pernambuco, Brazil Gabriel Alves de Lima --- Federal Rural University of Pernambuco, Brazil Ricardo Gallo --- Federal Rural University of Pernambuco, BrazilSeed quality is essential to ensure success in plant production. Traditionally, germination testing is widely used to assess seed viability, but it is a time-consuming process. Consequently, rapid tests have been increasingly explored due to their efficiency and speed. This...