Effect of biochar on chemistry, nutrient uptake and fertilizer mobility in sandy soil. Sika, M.P. (2012).

Abstract

Biochar is a carbon-rich solid material produced during pyrolysis, which is the thermal degradation of biomass under oxygen limited conditions. Biochar can be used as a soil amendment to increase the agronomic productivity of low potential soils. The aim of this study was to investigate the effect of applying locally-produced biochar on the fertility of low-nutrient holding, sandy soil from the Western Cape, and to determine the optimum biochar application level. Furthermore, this study investigates the effect of biochar on the leaching of an inorganic nitrogen fertilizer and a multi-element fertilizer from the sandy soil. The biochar used in this study was produced from pinewood sawmill waste using slow pyrolysis (450 °C). The soil used was a leached, acidic, sandy soil from Brackenfell, Western Cape.

Institution: University of Stellenbosch. Faculty of Agrisciences: Department of Soil Science

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The effect of inorganic fertilizer application on compost and crop litter decomposition dynamics in sandy soil. van der Ham, I. (2015).

Abstract

Inorganic fertilizer applications are common practice in commercial agriculture, yet not much is known regarding their interaction with organic matter and soil biota. Much research has been done on the effect of inorganic N on forest litter decomposition, yet very little research has focused on the effect of inorganic fertilizers on crop litters and, to our knowledge, none on composted organic matter. Furthermore none of the research has been done in South Africa...

Institution: University of Stellenbosch. Faculty of Agrisciences: Department of Soil Science

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The effect of long-term tillage practices on selected soil properties in the Swartland wheat production area of the Western Cape. Botha, P.B. (2013).

Abstract

The effect of long-term tillage on basic soil properties with respect to sustainability was investigated in this dissertation. Over the last three decades soil conservation has become an important prerequisite for sustainable agriculture. The primary aim of this study was to evaluate the effect of different tillage practices on the physical and some of the chemical properties of soil after 37 years of continuous application...

Institution: University of Stellenbosch. Faculty of Agrisciences: Department of Soil Science

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Evaluating the effect of crop rotations and tillage practices on soil water balances of selected soils and crop performances in the Western Cape. Swiegelaar, N.A. (2014).

Abstract

The aim of this study was to investigate the influence of crop rotation and soil tillage on the soil water balance and water use efficiency of wheat, canola, lupin and medics in the Swartland sub region of the Western Cape. This trail was conducted as a component study within a long-term crop rotation/tillage trial during 2012 and 2013 at the Langgewens Research Farm (33016’42.33” S; 18042’11.62” E; 191m) of the Western Cape Department of Agriculture near Moorreesburg...

Institution: University of Stellenbosch. Faculty of Agrisciences: Department of Soil Science

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Evaluering van grondvoorbereidingspraktyke wat in die wingerdbedryf uitgevoer word in terme van geselekteerde grondfisiese eienskappe. Kritzinger, D.J. (2011).

Opsomming

Die studie is in die Wes-Kaap Provinsie gedoen om die effek van grondvoorbereiding op geselekteerde grondfisiese eienskappe te ondersoek. Hierdie studie is genoodsaak deur die nadelige gevolge wat hoë gronddigthede op die groei en produksie van ’n wingerdstok het. Grondvoorbereiding in Suid-Afrika word toegepas om beperkende lae in die ondergrond te verwyder en sodoende ‘n groter grondvolume vir wortelgroei beskikbaar te stel. Die vraag is egter of dit altyd noodsaaklik is weens die vernietiging van voorkeur vloeikanale en die hoë kostes wat daarmee gepaard gaan. Die studie sluit verskillende grondvorms, verskillende dieptes van bewerking en verskillende tipes bewerking in asook hoe die toestande met verloop van tyd verander. Grondfisiese eienskappe wat ondersoek is, sluit in: bulkdigtheid (kluitmetode), infiltrasie (“mini disk” - en dubbelring infiltrometer), skuifsterkte (skroefblad-meter), grondsterkte (penetrometer) en wortelverspreidings (profielwand metode). Die studie is uitgevoer by drie verskillende proeflokaliteite, nl. Nietvoorbij, Kanonkop en Broodkraal...

Institution: University of Stellenbosch. Faculty of Agrisciences: Department of Soil Science

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Investigation of soil quality (health) in commercial production of rooibos tea (Aspalathus linearis) in the Western Cape, South Africa. Smith, J.F.N. (2014).

Abstract

The global demand for rooibos tea (Aspalathus linearis) has steadily increased over the past five years thanks to the increased awareness of its health benefits, while rooibos tea production has decreased. If this trend continues, rooibos producers will be unable to meet the world demand. What makes rooibos a particularly challenging crop to grow is the fact that it is a sensitive fynbos species, adapted to low soil nutrient conditions, which can only be cultivated in a niche area of the Western and Northern Cape regions of South Africa. The farmers are under great pressure due to increasing production costs and environmental laws which restrict the establishment of new rooibos fields in fynbos areas. The only way for farmers to meet the demand will have to be by increasing their tea yields and quality while using the same area of land. To date, very little research has been conducted to help the producers. Rooibos farmers report that yields decline dramatically over time since the clearing of the natural fynbos vegetation...

Institution: University of Stellenbosch. Faculty of Agrisciences: Department of Soil Science

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