Browsing Natural and Agricultural Sciences by Supervisor "Annandale, J.G. (John George), 1959-"
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Browsing Natural and Agricultural Sciences by Supervisor "Annandale, J.G. (John George), 1959-"
Now showing items 1-20 of 50
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(University of Pretoria, 2017)This study was conducted to better understand the usefulness of water footprint (WF) information for vegetable crops produced on a water-stressed aquifer in South Africa. Different methodologies were investigated in a ...
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(University of Pretoria, 2007-02-15)Objective of Research The interest in crop modelling started since the introduction and popularisation of computer technology, which facilitated the dynamic simulation of complex natural systems. In particular, crop growth ...
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(University of Pretoria, 2013)Can composting save the world from its human generated biological waste problem and give a diversifying organic agriculture a much needed boost at the same time? The age old natural process of composting has been well ...
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(University of Pretoria, 2014)Current irrigation scheduling technologies are limited to refilling the root zone based on measured or predicted amount of water stored within the root zone. This needs measurement of soil-water status and specifying soil ...
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(University of Pretoria, 2010-06-07)The leaching of nitrogen (N) and phosphorus (P) from the rootzone of cropping systems is a major contributor of non-point source pollution resulting in deterioration of fresh water supplies. An escalating world population ...
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(University of Pretoria, 2009-06-03)The environmental impact and sustainability of irrigation with coal-mine water was investigated from an agricultural point of view on different coal-mines in the Republic of South Africa. Field trials were carried out on ...
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(University of Pretoria, 2017)This study estimated the total volumetric water footprint (WF) of two vegetable crops, a root vegetable crop (carrot) and a leafy vegetable crop (Swiss chard) grown in Gauteng Province, South Africa. South Africa is a water ...
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(University of Pretoria, 2023-02)In his thesis, entitled “Evaluating and improving crop growth models for simulating genotype-by-environment interactions in sugarcane”, Matthew Jones has enhanced our capacity to assist sugarcane breeding using crop growth ...
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(University of Pretoria, 2019)As mining and industry continue to impact agricultural lands and waterways, and as competition for access to fresh water increases, the agricultural industry must adapt to grow crops in increasingly polluted lands using ...
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(University of Pretoria, 2000)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2021)An important part of developing sound water management strategies for crops is to identify phenological stages which are sensitive and insensitive to water stress in terms of yield and quality. This is particularly important ...
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(University of Pretoria, 2019)A study to understand the implications of shallow groundwater dynamics was carried out at Kasinthula Irrigation Scheme in Chikwawa District, Malawi. Water table fluctuations, groundwater salinities and soil solute levels ...
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(University of Pretoria, 2011)The southern region of Mozambique is characterized by arid to semi-arid climatic conditions with soils of poor fertility and low water retention capacity. The rainfall season is from September to April. In some areas, ...
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(University of Pretoria, 2011)Mozambique is a semi-arid area with unreliable rainfall distribution; therefore optimal planting dates are critical to ensure that maize is not stressed during critical stages. The objective of this research was to study ...
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(University of Pretoria, 2018)Bwanje Valley Irrigation Scheme experiences low maize yields and shortage of water in the winter irrigation season. The scheme is also under-utilized in terms of irrigated area during winter as only 145 ha is cultivated ...
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(University of Pretoria, 2019)Phaseolus vulgaris is an essential legume crop for Bwanje people, because of its protein content for low-income population and good market availability. However, its yield is very low below pontential (2-3 t ha-1). In terms ...
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(University of Pretoria, 2011-06-28)Soils with inherently low soil fertility, and nutrient depletion of fertile soils, are the root causes of declining per capita food production in Africa. On the other hand, demand for better water quality and strict ...
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(University of Pretoria, 2005-05-06)The most common management problem associated with irrigated agriculture is knowing when to apply irrigation and how much of it is required. This is termed irrigation scheduling. Despite numerous techniques and tools ...
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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, 2011-11-24)At present, and more so in the future, irrigated agriculture will take place under water scarcity. Owing to the global expansion of irrigated areas and the limited availability of irrigation water, there is a need to ...
Now showing items 1-20 of 50