Browsing Doctoral Degrees (Crop Science) by Title
Now showing items 1-20 of 30
-
Agronomic and physiological approaches to improving productivity of selected sweet potato (Ipomoea Batatas L.) cultivars in KwaZulu-Natal : a focus on drought tolerance.
(2016-01-25)Sweet potato (Ipomoea batatas L) is a resilient food security crop with wide adaptation characteristics and hence can fit well under smallholder production. Its importance as a food security crop in relation to drought is ... -
Climate change and variability impacts on crop production in the low potential smallholder farming regions of Zimbabwe.
(2016)Climate change and variability is one of the most serious global problems affecting many sectors in the world. It is considered to be one of the most serious threats to sustainable development with adverse impact on ... -
Conservation agriculture and its impact on soil quality and maize yield: A South African perspective.
(2018)The countries in sub-Saharan Africa (SSA) are faced with the problem of soil degradation resulting from unsustainable soil management practices such as conventional tillage (CT) and the removal of soil biomass from crop ... -
Cowpea seed quality in response to production site and water stress.
(2007)Cowpea (Vigna unguiculata. L) is an important African crop. However, it is also an underutilized grain legume. Consequently, there is not enough research data on cowpea seed physiology. Whereas there is evidence of cowpea ... -
Drought tolerance and water-use of selected South African landraces of Taro (Colocasia esculenta L. schott) and Bambara groundnut (Vigna subterranea L. Verdc)
(2013-11-18)Issues surrounding water scarcity will become topical in future as global fresh water resources become more limited thus threaten crop production. Predicted climate change and increasing population growth will place more ... -
Drought tolerance and water-use of selected South African landraces of Taro (Colocasia esculenta L. schott) and Bambara groundnut (Vigna subterranea L. Verdc)
(2013-11-14)Issues surrounding water scarcity will become topical in future as global fresh water resources become more limited thus threaten crop production. Predicted climate change and increasing population growth will place more ... -
The effect of maize-legume cropping system and nitrogen fertilization on yield, soil organic carbon and soil moisture.
(2015-10-21)Crop rotation and intercropping are regarded as better cropping in terms of yield improvement of both cereal and legume crops as compared to monocropping. A factorial experiment was carried out at three dryland localities ... -
Effects of biochar addition on soil nitrogen retention and vegetable uptake in intensive production systems, China.
(2017)China has a limited area of cultivated land per capita and an increasing population. Maintaining a high crop yield is essential to meet the large food demand and to assure grain self-sufficiency. With the pace of economic ... -
The efficacy of Moringa oleifera plant extracts against selected fungal and bacterial plant pathogens infecting selected vegetable crops in Zimbabwe.
(2018)Diseases and pests are among the major constraints to horticultural production worldwide, and this has been further exacerbated by mono-cropping production systems in response to increased food demands of an ever-expanding ... -
Emerging and new pests under climate change in Limpopo Province, South Africa.
(2018)Vegetable production is constrained by pests such as weeds, insects and diseases. The damage caused by pests and diseases can be highly exacerbated by climatic changes and variability. Poor agricultural practices play a ... -
An evaluation of source-sink relationships in three dry bean (Phaseolus vulgaris L.) cultivars.
(2015-03-07)The effect of intensities and times of source or sink related stresses on the growth and development of a determinant (Teebus) and two indeterminant (NEP 2, Bonus) dry bean (Phaseolus vulgaris L.) cultivars was measured ... -
Fluctuation of non-structural carbohydrates in the stem and ears of maize (Zea mays (L.)) during grain fill as influenced by water stress.
(2015-03-10)Stems of maize plants may serve as reservoirs for photosynthate produced in the leaves which may then be utilized for cell growth and maintenance requirements of the plants, and in particular for grain requirements ... -
Intergration of management practices towards improving hybrid maize yield, quality and nutritional compositions under rain-fed condition.
(2017)Maize (Zea may L.) is an important staple crop grown under different ecological conditions by both large-scale commercial and smallholder farmers in Southern Africa. The current changes in climatic conditions may propel ... -
Maize crop growth and development related to solar radiation.
(2015-04-23)The interception and reflection of solar radiant energy by maize crops was measured at Cedara using tube solarimeters. From the measured data the amount of PHAR that was intercepted was related to the L value of the ... -
Modelling deficit irrigation of wheat in Zimbabwe.
(2015-03-07)Wheat is grown in Zimbabwe during the relatively dry, cool winter with irrigation. On most large-scale farms, land resources exceed irrigation water resources. Consequently, the efficient use of water is of prime concern. ... -
Nutritional studies with a Spanish-type groundnut on an Avalon medium sandy loam soil.
(2015-04-23)Calcium requirements of a Spanish-type groundnut cultivar on an Avalon medium sandy loam soil. The effect of different levels of application of agricultural lime, dolomitic lime and gypsum on yield and quality of the ... -
Physiological basis of seed germination in Cleome gynandra (L.)
(2005)Dormancy characteristics and optimum conditions for germination of Cleome gynandra seeds have not been explained. Seed storage proteins were extracted, analysed with SDS-PAGE and sequenced. Seed proteins of Cleome were ... -
Pre-breeding of bottle gourd [Lagenaria siceraria (molina) standl.].
(2016)Abstract available in PDF file. -
Quantifying productivity and water use of sorghum intercrop systems.
(2016-03-10)Rural sub-Saharan Africa (SSA) faces the challenge of achieving food security under water scarcity amplified by climate change and variability. Under these conditions, it is necessary to adopt cropping systems that have a ...