Department of Soil Science
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Response of soil chemical properties to irrigation with winery wastewater on a well-drained sandy soil
(South African Society for Enology and Viticulture, 2019)Most wineries in South Africa dispose of their wastewater through land application. This is carried out by irrigating small areas of cultivated pasture with the wastewater or ponding, with the former being the more general ... -
Lipid humification by soil clays
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: We studied three aspects of the natural polymerisation (humification) of lipids by soil clays – namely, the products formed, reaction mechanism and kinetics – at environmental temperatures (c. 20–50°C). ... -
Improving phosphate fertilizer recommendations using soil phosphorus buffer capacity and evaluation of various P extraction tests on a variety of South-African soils
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: Phosphorus (P) fertiliser recommendations are based on extractable P levels as measured by a variety of extraction tests and should incorporate factors such as depth, bulk density and the soils phosphorus ... -
Soil and grapevine responses to irrigation with treated municipal and winery wastewaters
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: In recent years, water scarcity and the ongoing drought have had serious implications for the agricultural industry in the Western Cape. The present study investigated the sustainability of two different ... -
Organic and mineral fertilizer field trial on rooibos tea under Northern Cape climatic conditions
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: Prior to this study there was little or no information regarding fertilizer recommendations for cultivated rooibos tea under Northern Cape growing conditions. The first aim of the study was to examine the ... -
Design of a pot experiment to study the effect of irrigation with diluted winery wastewater on four differently textured soils
(South African Water Research Commission, 2016-01)Due to the intensification of environmental legislation, the wine industry is expected to find solutions for the treatment or re-use of winery wastewater. The objective of the study was to design and evaluate a pot experiment ... -
Effect of NPK application on rooibos (Aspalathus linearis) under Clanwilliam field conditions
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Currently no macronutrient fertiliser recommendations have been established for rooibos plants under field conditions. The aim of this study was to examine the interactive effect of NPK (nitrogen, phosphorus, ... -
Development, optimization and use of a reduced-sample, water dispersible clay extraction technique for taxonomic horizon discrimination
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Water dispersible clay (WDC) is defined as the colloid fraction which disperses in water without removal of cementing compounds or the use of dispersing agents. It is a commonly determined parameter and ... -
Evaluation of a peri-urban smallholder farmers’ soil amendment practices on soil quality and crop growth, yield and quality
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Peri-urban, smallholder farmers surrounding Cape Town, which are the main producers of fresh vegetables in the region, are generally not producing at their optimum level due to lack of agronomic support, ... -
Soil water balance and root development in Rooibos (Aspalathus linearis) plantations under Clanwilliam field conditions
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Rooibos (Aspalathus linearis) can only grow in certain parts of the Western– and Northern Capes, whereas the production declines every year. If the global demand trend continues to increase, the production ... -
The effect of irrigation scheduling on the performance of young apple trees in newly established orchards
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: During a study conducted in a newly established orchard on a gravelly soil in Grabouw, the most effective irrigation schedule for optimum performance, including root growth and root distribution, of ... -
Effect of different biochars on inorganic nitrogen availability
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Biochar (a fine pyrolysed organic material) is an amendment used to increase and sustain productivity, reduce environmental pollution and sequester carbon (C) in soils. Successes were reported in improving ... -
Prescribing innovation within a large-scale restoration programme in degraded subtropical thicket in South Africa
(MDPI, 2015)Commonly cited requirements for bridging the “science‑practice divide” between practitioners and scientists include: political support, communication and experimentation. The Subtropical Thicket Restoration Programme was ... -
Spatial variation, bias and experimental design in agronomic field trials: a case study of a farming systems trial in the Western Cape province, South Africa
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH SUMMARY: Detecting small statistically significant changes in an observed parameter (e.g. – yield) in response to applied treatments within field trials is a major challenge for modern agriculture, since we ... -
Soil moisture conservation in dryland viticulture as affected by conventional and minimum tillage practices
(South African Society for Enology and Viticulture, 1980)The effect of conventional clean cultivation, a straw mulch, chemical weed control and a grass sward on the soil moisture regime in a dryland vineyard was investigated. The results demonstrate that both a straw mulch and ... -
The effect of conventional and minimum tillage practices on some soil properties in a dryland vineyard
(South African Society for Enology and Viticulture, 1980)Preliminary results of a long-term viticultural tillage experiment comprising two groups of treatments, are reported. These groups are (i) a group of "minimum" tillage practices having received no mechanical soil tillage ... -
The effect of various supplementary irrigation treatments on plant and soil moisture relationships in a vineyard (vitis vinif era var. chenin blanc)
(South African Society for Enology and Viticulture, 1981)In a field plot trial with grape vines planted on a high potential soil, the soil moisture status on different irrigation treatment plots was compared with that of a dryland control. Soil moisture budgeting was based on ... -
The possible cause of red leaf disease and its effect on barlinka table grapes
(South African Society for Enology and Viticulture, 1993)The so-called red leaf (RL) phenomenon of Barlinka table grapes was investigated in the Hex River Valley, De Doorns. The symptoms of RL were found to resemble those of grapevine leafroll (GLR) disease to a certain extent, ... -
Nitrogen mineralisation in vineyard soils of the Western Cape as affected by soil management practices
(South African Society for Enology and Viticulture, 1995)Soil management practices like ridging, liming and irrigation are expected to affect the ability of microorganisms to mineralise plant residues in the soil through their effects on water regime, temperature, pH, organic C ... -
The effect of fertilisation on the performance of Barlinka table grapes on sandy soil, Hex River Valley
(South African Society for Enology and Viticulture, 1995)The response of Barlinka table grapes on grayish, sandy soil to irrigation-applied N fertilisation levels, patterns of N application, crop load and stock P and K fertilisation, were evaluated over a 12-year period in the ...
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