Browsing Theses and Dissertations (University of Pretoria) by Supervisor "Hammes, Pieter Snyman, 1941-"
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Browsing Theses and Dissertations (University of Pretoria) by Supervisor "Hammes, Pieter Snyman, 1941-"
Now showing items 1-20 of 20
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(University of Pretoria, 2005-07-26)Morphological and anatomical studies demonstrated the root formation characteristics of sweet potato. The presence and importance of preformed root primordia is recorded for the first time. On the vines root primordia are ...
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(University of Pretoria, 2006-02-20)Bacterial wilt caused by Ralstonia solanacearum has affected the potato industry in South Africa since 1914. Control of bacterial wilt is difficult and depends greatly on integrated management strategies. Little information ...
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(University of Pretoria, 2006-10-07)Please read the abstract in the section 07back of this document
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(University of Pretoria, 2002-09-04)The low and varying protein content and high crude fibre content of sunflower oil cake produced from sunflower seed create problems for the South African oil expelling industry. This prompted research into factors that may ...
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(University of Pretoria, 2008-08-08)The effect of cytokinin and gibberellin, and in particular a combination of the two, on termination of dormant potato tubers was investigated. The objective was to effectively terminate dormancy through the external ...
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(University of Pretoria, 2006-09-06)The effects of seed size on sprout growth of potato seed pieces were investigated in controlled temperature conditions. The objectives were to quantify the effects of seed size, plant growth regulators (gibberellin and ...
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(University of Pretoria, 2008)The research objectives were to examine the effect of soil nutrient status on the growth rate, reproductive development, yield components and yield of maize in a long-term trial. On the Experimental Farm of the University ...
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(University of Pretoria, 2007-08-29)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2006-12-11)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2003-08-18)The bulk of Zimbabwe’s groundnut (Arachis hypogaea L.) crop is grown on sandy soils in the smallholder sector where sustainable production is hindered by acid soil infertility. The study goal was thus to examine the effects ...
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(University of Pretoria, 2015)Maize is the world’s third most important cereal after wheat and rice. It serves as a staple food to more than 1.2 billion of the world population. However, its production is threatened by declining soil fertility; mainly ...
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(University of Pretoria, 2005-11-14)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2009-04-16)A Pest Risk Analysis was conducted on commodities imported as hand luggage from Cameroon, India and Kenya at O.R. Tambo International Airport. The initiation phase indicated that fruit, and to a lesser extent vegetables, ...
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(University of Pretoria, 1997)
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(University of Pretoria, 2007-07-12)Experiments were conducted with tomato under shade netting and with lettuce in a vertical hydroponic system at the Hatfield Experimental Farm, University of Pretoria. The objectives of the study were: 1. To evaluate the ...
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(University of Pretoria, 2007-02-08)High temperature limit successful potato cultivation in the lowlands of tropical regions. One effect of high temperature may be an increase in gibberellin activity that is inhibitory to tuberization. Paclobutrazol blocks ...
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(University of Pretoria, 2007-02-03)Salinity continues to be one of the world’s most serious environmental problems in agriculture. The increasing world population and urbanization are forcing farmers to utilize marginal lands as well as poor quality water. ...
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(University of Pretoria, 2003-07-15)Strategies to improve stem yield and juice quality in sweet sorghum were investigated in this study. Seed quality of sixty five accessions (landraces) from Botswana was investigated. Standard germination tests revealed ...
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(University of Pretoria, 2003-11-01)The effects of soil nutrient status on the performance of four South African wheat genotypes were investigated in a long-term fertilization experiment. The objective was to quantify the effects of soil fertility on yield, ...
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(University of Pretoria, 2007-02-08)The effect of source-sink relationships on the performance of tomato and hot pepper was investigated in glasshouse experiments by pruning tomato trusses and hot pepper fruit from plants trained to a single stem. The ...
Now showing items 1-20 of 20