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Browsing by Supervisor "Claassens, A.S. (Andries Stephanus), 1943-"
Now showing items 1-20 of 20
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(University of Pretoria, 1994)A short-term greenhouse pot experiment was conducted to determine the bioavailability of certain trace elements in organic fertilizers. Ni, Co, Cd, Cu, and Zn were selected for study. Lettuce (Lactuca sativa L. cv. Golden ...
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(University of Pretoria, 2006-05-20)Due to the fact that the mechanism of acquisition of phosphorus (P) by roots, is mainly by interception, sufficient P uptake is only ensured by maximal root development ("exploitation"). Pot and field trials were conducted ...
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(University of Pretoria, 2009-04-07)Many agricultural fields that have received long-term applications of P often contain levels of P exceeding those required for optimal crop production. Knowledge of the effect of the P remaining in the soil (residual effect) ...
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(University of Pretoria, 2007-04-11)Plant nutrient management plays a vital role in the success or failure of modern Lucerne production. In South Africa, Lucerne is produced under a wide range of climatic conditions, under dryland and irrigation and in some ...
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(University of Pretoria, 2005-05-06)In the tobacco production area of Nelspruit, a problem is experienced in increasing the phosphorus content of tobacco leaves to above0.25% despite of the high phosphorus content of the soil (higher than 30 mg/kg Bray 1). ...
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(University of Pretoria, 2010-07-05)Management-induced degradation of soil chemical and microbial quality is one of the most pressing concerns and a considerable threat to the sustainability of agroecosystems. However, information on this important issue is ...
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(University of Pretoria, 2003-03-18)Management-induced degradation of soil chemical and microbial quality is one of the most pressing concerns and a considerable threat to the sustainability of agroecosystems. However, information on this important issue is ...
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(University of Pretoria, 2006-10-17)In a study to investigate the fate of the applied P in soils, a red-sandy clayey soil (Ferric Luvisols) from Rustenburg (high P fixing) and a red-sandy loam soil (Ferric Acrisols) from Loskop (low P fixing) were used. ...
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(University of Pretoria, 2006-05-06)Land and water degradations are serious environmental concerns facing South Africa. One of the major causes is human-induced soil erosion due to intensified land uses and environmental degradation caused by bad agricultural ...
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(University of Pretoria, 2004)Accelerated soil erosion is one of the major threats to agricultural production in Ethiopia and the Harerge region is not exceptional. It is estimated that about 1.5 billion tones of soil is being eroded every year in ...
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(University of Pretoria, 2005)The influence of pH on metal extractability from two sacrificial soils that received large amounts of biosolids was studied in four separate trials. The soils (Soil 1: gravelly sandy loam; Soil 2: sandy clay loam) were ...
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(University of Pretoria, 2007-04-07)The coal industry of Mpumalanga Province is faced with the problem of developing cost effective ways of using large volumes of calcium and magnesium sulphate enriched waste waters. Use of the waste waters for agricultural ...
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(University of Pretoria, 2005-10-10)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2006-05-06)This study indicated that sewage sludge could be used as an alternative to commercial inorganic fertilizers. It is common practice in South Africa to use agricultural land for disposal of sewage sludge. The disposal of ...
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(University of Pretoria, 2014)Nitrogen is required by plants in large quantities and its deficiency is mostly related to reduction in crop production. A study was conducted to assess the importance of nitrogen in tomato (Lycopersicon esculentum Mill.) ...
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(University of Pretoria, 2007-04-07)No abstract available.
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(University of Pretoria, 2007-10-25)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2007-02-20)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2010-06-07)An imperative of the South African government is to increase agricultural production in rural areas. In support of this, a project was initiated in the Mlondozi district of Mpumalanga Province under the National LandCare ...
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(University of Pretoria, 2008-07-16)Please read the abstract in the section "front" of this document.
Now showing items 1-20 of 20