Department of Soil Science
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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 ...
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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, ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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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The effect of irrigation system and crop load on the vigour of Barlinka table grapes on a sandy soil, Hex River Valley
(South African Society for Enology and Viticulture, 1995)The effect of drip and micro-sprinkler irrigation, as well as crop load, on the vigour of Barlinka table grapes was studied in a field trial in the Hex River Valley over a 12-year period. Regulating soil water by means of ...
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An assessment of winery wastewater diluted for irrigation of grapevines in the Breede River Valley with respect to water quality and nutrient load
(South African Society for Enology and Viticulture, 2015)Possible re-use of winery wastewater for irrigation was investigated in a field trial with micro-sprinklerirrigated Cabernet Sauvignon/99 Richter in the Breede River Valley region of South Africa. Irrigation with winery ...
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The effect of residue management on the nutrient cycle in the production of rooibos (Aspalathus linearis) at Nieuwoudtville, Northern Cape
(Stellenbosh : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Rooibos (Aspalathus linearis) is a sensitive fynbos species with a large genetic variation, adapted to acid, nutrient poor soils, and can only be grown in certain parts of the Western- and Northern-Cape. ...
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An evaluation of lime Requirement methods for selected South African soils
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: A laboratory study was conducted to evaluate seven widely used methods to predict soil lime requirement (LR) using 20 acidic South African top and sub-soils with a wide range of properties. The LR methods ...
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Long-term effect of tillage and crop rotation practices on soil C and N in the Swartland, Western Cape, South Africa
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Soil Organic Matter (SOM) is an important indicator of soil quality influencing nutrient availability, water infiltration and retention and soil biological activity. The loss of SOM due to intensive ...
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Effects of tillage practices on some key soil parameters : A case study in the Kwazulu-Natal Midlands, South Africa
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRAT: Soil organic carbon in its different forms play an important role in the biological, chemical and physical quality of the soil and need to be better understood and managed to farm in a sustainable manner. ...
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The effect of composted biochar on compost properties and mineralisation
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: Pyrolized carbon, also known as biochar, is a widely used soil conditioner recognized for its adsorption, C sequestration and agricultural qualities. This led to the investigation into the possible use ...
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Investigating the suitability of land type information for hydrological modelling in the mountain regions of Hessequa, South Africa
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT: The Land Type database of South Africa combines soil associations with various terrain positions within a larger Land Type polygon. The Land Type structure provides the opportunity to unlock the terrain ...
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Effect of irrigation using diluted winery wastewater on vitis vinifera l. cv. cabernet sauvignon in a sandy alluvial soil in the Breede River Valley – vegetative growth, yield and wine quality
(South African Society for Enology and Viticulture, 2016-09)The re-use of winery wastewater for irrigation was investigated in a field trial with micro-sprinklerirrigated Cabernet Sauvignon/99Richter in the Breede River Valley region of South Africa. Irrigation with winery ...
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Spatial soil information in South Africa : situational analysis, limitations and challenges
(Academy of Science of South Africa, 2015)Soil information is vital for a range of purposes; however, soils vary greatly over short distances, making accurate soil data difficult to obtain. Soil surveys were first carried out in the 1920s, and the first national ...
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Effect of irrigation with diluted winery wastewater on phosphorus in four differently textured soils
(South African Society for Enology and Viticulture, 2016-04)The wine industry needs solutions for wastewater treatment, as environmental legislation for its disposal is increasingly being enforced due to non-compliance. The feasibility of re-using diluted winery wastewater was ...
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Seasonal variation in composition of winery wastewater in the Breede River Valley with respect to classical water quality parameters
(South African Society for Enology and Viticulture, 2016-10)The annual wastewater quality dynamics of a winery from which wastewater was sourced for a field experiment investigating the dilution of winery wastewater for vineyard irrigation were determined. Annual mean monthly pH ...
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Quantifying the catchment salt balance : an important component of salinity assessments
(Academy of Science of South Africa, 2015)Soil and stream salinisation is a major environmental problem because it reduces the productivity of landscapes and degrades water quality. The Berg River (South Africa) has been exhibiting a trend of increasing salinity ...
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Trace element composition of two wild vegetables in response to soil-applied micronutrients
(Academy of Science of South Africa, 2014)Wild vegetables are an important commodity in the subsistence farming sector. They are considered to be rich in micronutrients and can therefore be used to overcome inadequate nutrition. However, research on micronutrients ...
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The effect of once-off tillage on selected soil physical and chemical properties and resultant crop response on a shale derived soil under no-till in the Swartland sub-region of the Western Cape
(Sellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Conservation agriculture is widely adopted by farmers who claim that any soil disturbance will be detrimental to both soil physical and chemical properties. However, as the effect of reduced tillage and ...
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