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Effects of level and timing of irrigation on growth and water use of lucerne
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Department of Agriculture and Water Supply, S.A. Barnard --- Department of Agriculture and Water Supply,A six-year flood irrigation trial with lucerne (Medicago sativa cv. Karoo) was conducted on a sandy loam soil in the south-western part of the Cape Province at Oudtshoorn. Two cropping practices, whereby one or two forage cuttings are followed by... -
Use of estimated leaf water potential for irrigation timing of wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa F.J. Dijkhuis --- , Republic of South AfricaA regression model with which the leaf water potential (LWP) of wheat can be estimated from soil water content and potential evapotranspiration was developed from data generated during 1986. This model was used during the 1988 wheat season to decide... -
Possible flood irrigation technologies to reduce water use of Sultanina grapevines in a hot, arid climate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , South AfricaGrowth, production and water use efficiency of Sultanina grapevines irrigated by means of methods where only a fraction of the soil was wetted, were compared to full surface flood irrigation in the hot, arid Lower Orange River region of South... -
Water use of maize in response to planting density and irrigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. B.O. Ogola --- Department of Plant Production, South Africa T.R. Wheeler --- Department of Agriculture, UK P.M. Harris --- Department of Agriculture, UKThis study aimed to quantify the effect of plant population density and irrigation on the water use efficiency (q) of maize crops, with particular emphasis on the partitioning of water use into transpiration (T) and direct evaporation of water from... -
Evapotranspiration of Vitis vinifera L. cvs Sunred Seedless and Muscat Supreme in response to soil water depletion and irrigation cutoff during berry ripening
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , South Africa C.L. Howell --- , South AfricaThe effects of soil water depletion and irrigation cutoff during ripening on yield, quality and evapotranspiration (ET) of table grapes were studied to refine irrigation strategies needed during hot, dry summers. Six irrigation treatments were applied to two cultivars, viz... -
Soil water variability in the Weatherley grassland catchment, South Africa: I. Evapotranspiration
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CW van Huyssteen --- Department of Soil, Crop and Climate Sciences, South Africa TB Zere --- Department of Soil, Crop and Climate Sciences, South Africa M Hensley --- Department of Soil, Crop and Climate Sciences, South AfricaEvapotranspiration (ET) is a major component of the soil water balance and therefore requires accurate determination to quantify catchment water yield. Six-year daily ET was determined at 300 mm depth intervals in the root zone of 28 soil profiles in... -
FAO-type crop factor determination for irrigation scheduling of hot pepper (Capsicum annuum L.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Y.A. Alemayehu --- Department of Plant Production and Soil Science, South Africa J.M. Steyn --- Department of Plant Production and Soil Science, South Africa J.G. Annandale --- Department of Plant Production and Soil Science, South AfricaHot pepper (Capsicum annuum L.) is an irrigated, high value cash crop. Irrigation requirements can be estimated following a FAO crop factor approach, using information on basal crop coefficients (Kcb), crop coefficients (Kc) and duration of crop growth stages. However,... -
Quantification of the soil-water balance under different veld condition classes in a semi-arid climate
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: H.A. SnymanThe monthly herbage production, water-use efficiency (WUE: above-ground phytomass production per unit of evapotranspiration), surface runoff and soil loss were determined on grassland in three different ecological conditions, viz. poor, moderate and good, over a four year (1995/1996 to 1998/1999)... -
Exploring ground-based methods for the validation of remotely sensed evapotranspiration
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Andiswa Finca --- Agricultural Research Council–Livestock Business Division, South Africa Anthony R Palmer --- Agricultural Research Council–Livestock Business Division, South Africa Vincent Kakembo --- Centre for African Conservation Ecology, South AfricaAccurate estimates of evapotranspiration (ET) are essential when calculating catchment-scale water balances. An open top chamber (OTC), a ground-based method for measuring actual ET, was used to validate modeled ET from earth observation MODIS and agrometeorological data. We studied and... -
Economic evaluation of water loss saving due to the biological control of water hyacinth at New Year’s Dam, Eastern Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GCG Fraser --- Department of Economics and Economic History, South Africa MP Hill --- Department of Zoology and Entomology, South Africa JA Martin --- Department of Economics and Economic History, South AfricaWater hyacinth Eichhornia crassipes is considered the most damaging aquatic weed in the world. However, few studies have quantified the impact of this weed economically and ecologically, and even fewer studies have quantified the benefits of its control. This paper... -
Vegetation responses to seasonal weather conditions and decreasing grazing pressure in the arid Succulent Karoo of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Ute Schmiedel --- Institute for Plant Science and Microbiology, Germany Jens Oldeland --- Institute for Plant Science and Microbiology, GermanyThe Succulent Karoo biome is a renowned centre of biodiversity and endemism in the arid winter rainfall region of South Africa that is threatened by climate change. On 20 permanently marked plots within a biodiversity observatory, species richness and cover... -
Response of tomato cultivars to irrigation management strategies employed by emerging farmers in the Greater Giyani Municipality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tebogo J Lebea --- , South Africa Nebo Jovanovic --- , South Africa Mapotso Kena --- , South Africa Kwabena K Ayisi --- , South Africa Wisani G Mushadu --- , South AfricaIntensification of low-tech agricultural production is required in the Greater Giyani Municipality (Limpopo province, South Africa) to respond to changing climatic conditions, water scarcity and increased food demand of the local market. Two years of field experiments were conducted on... -
Use of remotely sensed derived metrics to assess wetland vegetation responses to climate variability-induced drought at the Soetendalsvlei wetland system in the Heuningnes Catchment, Western Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NC Ndlala --- , South Africa T Dube --- , South AfricaWetland vegetation plays an important role in the environmental functioning of wetlands through the provision of ecosystem services, such as food and critical habitat for organisms that live in or near water resources. The ecosystem services provided by wetland vegetation... -
Long-term reference evapotranspiration trend and causative factors analysis in the sugarbelt area of the midlands of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zoleka Ncoyini-Manciya --- , South Africa Michael John Savage --- , South Africa Sheldon Strydom --- , South Africa Alistair David Clulow --- , South AfricaGlobal warming is widely recognised, and its effects are becoming apparent throughout the world. Evaporation and evapotranspiration, the key components of the hydrological cycle, are generally expected to increase due to the rise in air and surface temperatures. However, previous... -
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...