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Browsing Theses and Dissertations (Plant Production and Soil Science) by Type "Dissertation"
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Bezuidenhout, Suzette Rene
(University of Pretoria, 2001)
Please read the abstract in the 00front part of this document.
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Mkula, Ntombizanele Precious
(University of Pretoria, 2007-08-27)
Silverleaf nightshade (Solanum elaeagnifolium), a perennial broadleaf weed, has become a serious pest in many semi-arid areas of the world. Control of silverleaf nightshade is confounded by its ability to produce thousands ...
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Van der Laan, Michael
(University of Pretoria, 2007-04-04)
The alien invader plant Parthenium hysterophorus is a Category 1 weed in South Africa, where it poses a serious threat to indigenous vegetation in particular, and to biodiversity in general. In addition to its competitive ...
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Malatji, Matseleng Wendy
(University of Pretoria, 2013)
Conyza bonariensis, flaxleaf fleabane, is a major weed threat on cultivated and non-cultivated lands, gardens, roadsides and waste places. The weed in South Africa is believed to have originated from South America, and the ...
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Bothma, Anneline
(University of Pretoria, 2006-10-07)
Silverleaf nightshade is a serious problem weed in many semi-arid regions of the world. Although many research efforts have been devoted to this weed’s interference with crop species, possible chemical interference ...
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Dixon, Gemma Michelle
(University of Pretoria, 2009-11-10)
It has been suggested that the Category 1 weed, Campuloclinium macrocephalum (Less) D.C has allelopathic potential, which would, at least partially, explain its apparent success as an alien plant in South Africa. Studies ...
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Botha, Christelle Charle
(University of Pretoria, 2001)
Please read the abstract in the dissertation
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Nxumalo, Deliwe Maria
(University of Pretoria, 2019)
The discovery of antibiotics has been one of the major breakthroughs in the history of medicine for the treatment of microbe-related infections. Soil-borne microorganisms have been known to potentially produce clinically ...
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Mkatshane, Zimasa
(University of Pretoria, 2019-08)
Medicinal plants play a crucial role in the healthcare treatment of many infections and also serve as the basis for the synthesis of novel chemotherapeutic agents. Included in these plants is the Tabernaemontana genus ...
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Gibango, Lydia
(University of Pretoria, 2024-02-01)
Tuberculosis (TB) has plagued humanity for centuries, ranking as one of the leading causes of death globally. It surpasses even HIV/AIDS in mortality caused by a single infectious biological agent. Since 1997, the World ...
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Njoloma, Chikondi
(University of Pretoria, 2012)
Most of the fields planted with clonal tea in Malawi are deficient in micronutrients. This was evident in leaf analysis data collected in 2007 from 170 mature clonal tea fields of some of the tea estates in Malawi, which ...
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Seome, Daphney Gaafele
(University of Pretoria, 2013)
The potato (Solanum tuberosum L.) crop serves as a staple food worldwide and is capable of
reducing the world’s food shortages because unlike cereals and other agricultural crops, it is less
affected by prices in the ...
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Marava, Garikai
(University of Pretoria, 2016)
Maize (Zea mays L) is a staple food crop grown in South Africa by both large scale commercial and smallholder farmers. During the 2013/14 cropping season maize occupied about 2.6 million hectares of the total 3.9 million ...
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Moshabesha, Mantsele Thuso Sylvia
(University of Pretoria, 2019-12)
Fusarium spp. cause significant losses in yield and quality in the maize (Zea mays L.) industry.
Fusarium pathogens affect the development of the plant tissue and the quality of the grain. The
mycotoxins produced by ...
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Conrad, Robert
(University of Pretoria, 2018)
Plant growth-promoting rhizobacteria (PGPR) are bacteria that colonize the
rhizosphere and/or roots in the presence of other soil microflora and have growth
promotion activity and/or biocontrol activity. Plant growth-promoting ...
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Sam, Mpaballeng Catherine
(University of Pretoria, 2016)
The aim of this study was to calibrate and decide on the most appropriate sap flow technique for citrus species in the laboratory by pushing water through cut branches. Various sap flux density techniques, including heat ...
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Van Rooyen, Garth
(University of Pretoria, 2018)
The release of carbon dioxide from wetland soils is a phenomenon which involves several biochemical processes and environmental conditions. Heterotrophic respiration through the metabolisation of organic material by ...
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Kamper, Maarten
(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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Theron, Cheyenne Amor
(University of Pretoria, 2022)
Many countries have established commercial plantations of Pinus spp. to accommodate a growing demand for wood and timber products. In the Southern Hemisphere, where Pinus spp. are non-native, establishment of these plantations ...
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Matakala, Nalukui
(University of Pretoria, 2019-09)
Classification of tree species into excluders or accumulators is vital for ecological restoration of mine tailings dams via phytostabilization. The study dealt with classification of indigenous tree species found on tailings ...