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Tesis sobre el tema "Soil composition south africa"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 7 de febrero de 2022

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1

Van, Tonder Carlo. "Factors influencing species richness, cover and composition of vegetation on Namaqualand quartz fields." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/630.

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Quartz fields contribute significantly to plant diversity in the Succulent Karoo biome. They are distinctly different from surrounding habitats and have high levels of plant endemism. Biological soil crusts are features of quartz field soils and fulfill a vital function in that they stabilize soils. It is important for managers of nature reserves and agricultural rangelands to know what factors influence quartz field soils and vegetation. Both stakeholders could benefit from new information that would allow for informed decision-making regarding land-use on quartz fields. The present study too

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2

Nchabeleng, Lehlohonolo. "Effects of different climatic and soil factors at different locations on chemical composition of bush tea (Athrixia phylicoides DC.)." Thesis, University of Limpopo (Turfloop Campus), 2012. http://hdl.handle.net/10386/740.

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3

Venter, Annari. "Comparing plant yield and composition with soil properties using classical and geostatistical techniques." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/23916.

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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 areas throughout the year. This means that there is a continuous demand for nutrients under a wide range of environmental conditions. The most important factors affecting the nutrient requirement of Lucerne is yield, the cutting schedule, climate and management practices. To enable site-specific crop requirements, the spatial variation of soil and plant properties within a fi

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4

Mabuza, Thembisile Veronicah. "Evaluating long term effects of fire frequency on soil seed bank composition and species diversity in a semi-arid , South African savanna." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/346.

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Fire is generally used as a management tool for different vegetation types such as savannas and grasslands in southern Africa. In the False Thornveld of the Eastern Cape, fire is commonly used to control bush encroachment and to increase grass production, as grasses are important source of forage for domestic livestock. At the University of Fort Hare farm in the Eastern Cape, a trial was set up in 1980 to investigate the effect of burning frequency on vegetation. There are six treatments replicated twice in a completely randomized design on a 100 m x 50 m plots. The treatments comprise no burn

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5

Samson, Heidi E. (Heidi Estrelita). "Psychrotolerant mucoralean fungi present in pristine mountain fynbos soil and vineyard soil from the Stellenbosch region." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52423.

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Thesis (MSc)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: Mucoralean fungi are mostly saprotrophs that are frequently encountered in soil habitats. Using an isolation temperature of circa 25°C, other workers obtained these fungi from a wide diversity of geographical areas in southern Africa. However, it is known that psychrotolerant mucoralean fungi, able to grow at 25°C as well as at 5°C, occur in pristine Alti Mountain Grassland. Nothing is known about the diversity of these psychrotolerant soil fungi in other vegetation types of South Africa. Consequently, in this study,

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6

Prince, Lloyd T. "Composition portfolio." Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1002318.

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7

Boers, David Winson. "Optimal composition of hedge fund replicators in South Africa." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/59809.

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The purpose of this paper was to explore the passive replication of hedge fund returns as an alternative means of investment. Current popular techniques have generally shown poor out-of-sample performance. This research aimed at creating an equity factor model through the use of the "style engine" created in Muller and Ward (2013). The sample hedge funds were used to create both single period and multi period rolling window portfolios of styles. The model was able to portray the investment styles of the selected samples and imitated the in-sample performance well. However, many of the out-of-s

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8

Buitendag, Kingsley Alexander. "A short composition portfolio." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1002297.

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9

Wynne, Donovan. "Composition portfolio." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1003121.

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Introductory remarks: Being a middle-class white South African, I grew up on a diet of predominantly "white" music: rock, pop and Western classical music. I was later introduced to a broader range of musics: blues, jazz, kwaito and traditional Southern African idioms. I found myself particularly attracted to the traditional music of the amaXhosa (especially that of the uhadi bow), possibly due to the fact that this music is hexatonic (that is, based on two major triads whose tonics are one tone apart), a system that bears certain resemblances to the Western tonal idiom. However, much of my mus

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10

Mills, A. J. "Reciprocal relationships between vegetation structure and soil properties in selected biomes of South Africa." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53567.

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Thesis (PhD) -- Stellenbosch University, 2003.<br>Please refer to full text to view abstract.<br>ENGLISH ABSTRACT: The effects of different land use practices on soil quality in South Africa were investigated in five contrasting biomes, with a particular emphasis on the tendency of soils to crust and soil C content. Soil quality is a nebulous concept and its applicability in the South African landscape is scrutinised. A wide range of chemical and physical soil properties were examined. The tendency of soils to crust was assessed using modulus of rupture, water dispersible clay and a new m

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11

Kapp, Caro. "Nematode soil community structure and function as a bio-indicator of soil health in fynbos and deciduous fruit orchards." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80089.

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Thesis (MScAgric)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Soil is a fundamental, non-renewable resource in any ecosystem. To uphold food production for increasing global human populations, it is imperative to develop ways in which to sustain healthy biological productivity and sustainability of agricultural soils. Nematodes are one of the most abundant groups of Metazoa occurring in all soils, and form an integral part of the soil food web at several trophic levels. They respond rapidly to changes within their environments, and can easily be extracted from soil, identified and cha

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12

Hendricks, Neile Oliver. "Vegetation, soil and grazing relationships in the Middelburg District of the Eastern Cape." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53711.

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Thesis (MSc)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Arid and semi-arid rangelands of the Nama-Karoo Biome are believed to have changed considerably since the arrival of domestic livestock in the veld. Severe grazing pressure is considered to be one of the prime factors responsible for the perceived degradation of vegetation and concurrent soil degradation. To understand the process of degradation and to make further recommendations for future veld restoration, a large-scale project was undertaken in the Eastern Cape. This project focused on the role that landscape heter

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13

Germishuys, Hendrik Johannes. "'n Ondersoek na gronderosie in die Swartland." Thesis, Cape Technikon, 1992. http://hdl.handle.net/20.500.11838/2171.

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Thesis (MTech (Civil Engineering))--Cape Technikon, 1992.<br>In the Western Cape, gully ("donga") erosion is characteristic of the Swartland area where the effects of the problem have reached spectacular dimensions. In 1942 the Social and Economic Planning Council commissioned an investigation into the distribution and prevention of gully erosion. This investigation was led by Professor W J Talbot of the University of Cape Town, with the collaboration of researchers from the University of Stellenbosch. This led to the "Swartland and Sandveld" publication in August 1945. Little progress h

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14

Nebo, Godwin Iloabuchi. "Soil aggregates characteristics and interrill erosion in some weakly weathered coarse textured ecotopes in Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1004351.

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Aggregate stability and aggregate size distribution on soil surface that is impacted by rain drops affect soil erosion yet little is known about less weathered coarse textured soils. The objectives of the current study were to determine (i) the aggregate stability and associated aggregate fraction size distribution and (ii) the impact of the initial aggregate size on the aggregate stability and the resulting sediment fraction size distribution following rain drop impact in some quartz dominated coarse textured soils in the Eastern Cape Province. Soil samples for this experiment were collected

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15

Everitt, Simon James. "Evolution of the UG2 unit, Bushveld Complex, South Africa : mineral composition and petrological evidence." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001573.

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Several disequilibrium textures are found to occur within the hanging wall and footwall of the UG2 chromitite layer of the Bushveld Complex, South Africa. These textures include plagioclase chadacrysts found included within orthopyroxene and clinopyroxene as well as the orthopyroxenes exhibiting round crystal boundaries that appear to be resorbed. Textures found within the UG2 stratigraphy such as linear boundaries and 120° triple junctions at interfaces of adjacent plagioclase or pyroxene grains also suggest that recrystallization has taken place. The presence of both disequilibrium textures

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16

Becker, Carina Helene. "The influence of soil properties on the growth and distribution of Portulacaria Afra in subtropical thicket, South Africa." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1013046.

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Subtropical Thicket is the dominant vegetation biome in the Eastern Cape, and extends through to parts of the Western Cape. It is dominated by Portulacaria afra (spekboom), a woody succulent plant recognised for its importance as an ecosystem engineer and its carbon sequestration potential. Due to excessive grazing from domestic stock, spekboom has been completely removed from some areas. The Subtropical Thicket Restoration Programme (STRP) initiated a large scale restoration programme of planting spekboom cuttings in these degraded areas. Their efforts have been met with varying levels of suc

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17

Mwepu, Mireille K. M. "Attenuation of ionic pollutants in selected South African soils." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/2516.

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Thesis (MScAgric (Soil Science))--University of Stellenbosch, 2007.<br>Two–thirds of South Africa, including more than 280 towns and settlements are largely dependent on groundwater for their drinking water supply and development. However, groundwater resources in South Africa are limited both in terms of quantity and quality, especially in the semi–arid parts of the country (Sililo et al., 2001, p. i). Therefore, the importance of protecting groundwater resources from pollution has been recognized. The first objective of this research was to investigate the attenuation capacity of a se

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18

Francis, Michele Louise. "Soil Formation on the Namaqualand Coastal Plain." Link to the Internet, 2008. http://hdl.handle.net/10019/806.

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19

Cilliers, Charl Daniel. "Post-fire effects of invasive exotic plants on seed banks, regeneration, soil chemistry and selected soil microbial populations in the Silvermine Nature Reserve, Cape Peninsula, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53006.

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Thesis (MSc) -- University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: The fires, which occurred during January 2000 on the Southern Cape Peninsula, Cape Province, South Africa, focused attention on the importance of sound, informed management of exotic plant invaders in fynbos, especially at the urban interface. The fires also highlighted the relative lack of knowledge about the combined impacts of fire, exotic plants and the exotic-clearing programme on soil seed banks and regeneration. This study examines soil borne seed banks, regeneration, soil chemistry and micro biota in different

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20

Van, der Waal Benjamin Wentsel. "The influence of Acacia Mearnsii invasion on soil properties in the Kouga Mountains, Eastern Cape, South Africa." Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005515.

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The invasion of Acacia mearnsii in the Kouga catchment, Eastern Cape, South Africa, has various negative impacts on the ecosystem. These impacts include: reduced species richness, increased water use, increased nutrients and increased N cycling rates. The native shrubby fynbos vegetation has adapted to the acidic nutrient poor soils and Mediterranean climate of the Kouga Mountains. Fynbos, however, is currently being out competed by the much taller Acacia mearnsii trees, due to their competitive nature and ability to fix nitrogen, thereby enriching the soil. The invaded sections of the valley

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21

Ndhlovu, Rachel Tintswalo. "Temporal variability in the fatty acid composition of suspension-feeders and grazers on a South African rocky shore." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1020879.

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Numerous ecological studies have used lipids to determine trophic pathways in aquatic systems, as fatty acid profiles provide time-integrated information on an organism’s assimilated diet. Many of these studies have, however, been based on sample collections with a limited temporal scale. The trophic ecology of pelagic systems has been studied intensively using fatty acid analyses, but very little work has been directed toward benthic communities, with the intertidal being especially neglected. The investigation of trophic pathways within rocky shore communities will help us to better understa

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22

Peter, Prince Chinedu. "Implication of tillage, texture and mineralogy on the sieving efficiency, physical-based soil organic matter and aggregate stability of some soils in the Eastern Cape." Thesis, University of Fort Hare, 2015. http://hdl.handle.net/10353/2710.

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Soil structure and its associated physical properties are essential soil components. Soil texture and mineralogy are inherent soil properties that influence soil management. This study assessed the implication of tillage, texture and mineralogy on soil sieving, aggregate stability indices and physical fractions of organic matter in soils of Eastern Cape Province of South Africa. An Iris FTLVH – 0200 digital electromagnetic sieve shaker (Filtra Vibraciόn SL Spain), was used to determine settings for sieving efficiency. Mean weight diameter (MWD), water stable aggregate (WSA), state of aggregati

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23

Salie, K. (Khalid). "The contribution of riparian vegetation to the species composition of the Jonkershoek Valley in Stellenbosch, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/49790.

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Thesis (MSc)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Many authors express the value of riparian vegetation in terms of the function and number of species per unit area. Although riparian vegetation is confined to narrow bands of plants along watercourses, kloofs and gullies, it is a specialised habitat for many species. To determine the contribution of riparian vegetation to the species richness of the Jonkershoek Valley, Western Cape Province, South Africa, a checklist was compiled, by referring to past research and to the PRECIS national database for the South African f

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24

Boucher, Kim Gillian. "The effect of pineapple cultivation on factors influencing soil erodibility in the Eastern Cape, South Africa." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005502.

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The study examines the effect of ridged pineapple cultivation on factors influencing the soil erodibility of Glenrosa and Oakleaf soil forms in the Bathurst district of South Africa. A number of physical and chemical variables influencing soil erodibility are investigated, namely soil moisture, bulk density, porosity, infiltration rate, aggregate stability, shear strength, soil texture, soil structure, penetrability, organic carbon, pH and cation exchange capacity. These soil characteristics are examined in undisturbed soils under natural vegetation and compared to those on adjacent traffic ar

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25

Snyman, Caroline Lucie Charlotte. "The influence of base wine composition and wood maturation on the quality of South African brandy." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53770.

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Dissertation (PhD)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: Brandy production is a multi-step process that involves grape harvesting, base wine fermentation, distillation, wood maturation and blending. Within each of these production process steps there are a number of factors that can influence the composition and resultant quality of the base wine, unaged and wood matured distillates. These factors include geographic and climatic features of the origin of grapes used, viticultural practices, grape maturity, grape variety, vintage variation, vinification techniques, stora

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26

Kotsedi, Daisy. "The response of microalgal biomass and community composition to environmental factors in the Sundays Estuary." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1434.

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The Sundays Estuary is permanently open to the sea and has been described as channel-like along its entire length with a narrow intertidal area (mostly less than 5 - 6 m in width). The estuary experiences regular freshwater inflow with large supplies of nutrients, derived from the Orange River transfer scheme and agricultural return flow. In particular, nitrate concentrations are high as a result of fertilisers used in the Sundays River catchment area. The objectives of this study were to measure microalgal biomass and community composition and relate to flow, water quality and other environme

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27

Herselman, Jacoba Elizabeth. "The concentration of selected trace metals in South African soils." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/1390.

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Thesis (PhD (Soil Science))--University of Stellenbosch, 2007.<br>Trace elements occur naturally in soils, usually at low concentrations (<0.1% or <1000 mg kg-1 of the earth’s crust), as a result of weathering and pedogenic processes acting on the rock fragments from which soil develops (parent material). Since about 98% of human food is produced on land, soil is the primary source supplying these elements to the food chain. Although cases of trace element deficiency and toxicity have been documented in many parts of South Africa, no comprehensive description of trace element concentration has

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28

Mzobe, Pearl Nonjabulo. "Sediment linkages in a small catchment in the Mount Fletcher southern Drakensberg region, South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013224.

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Soil erosion is a persistent problem that requires continued control efforts as agricultural land loses productivity and communities dependent on the land become increasingly vulnerable to decreased food security. The negative effects of soil erosion in Khamopele River catchment, in the Mount Fletcher southern Drakensberg region of South Africa, are manifest in extensive gullying and wetland loss. Soil erosion has resulted in siltation in a recently constructed dam and the alteration of aquatic habitats. This research was undertaken to identify the sources of eroded sediment in the small upper

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29

Smith, Janis. "A spatial and temporal analysis of elephant induced thicket degradation in Addo Elephant National Park." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1012903.

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Thicket degradation within the Addo Elephant National Park (AENP), Eastern Cape, South Africa is a key issue of concern. The increasing elephant densities have over time threatened thicket vegetation, which is endemic to this area. The “elephant problem” within the Park has raised many concerns as to the vulnerability of thicket to elephant impacts. Remote sensing provides an environment in which temporal changes in thicket vegetation condition can be assessed. The main aim of this study was to assess temporal and spatial trends in thicket degradation within the AENP, using multi-temporal sate

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30

Wessels, Pieter Gerhardus Wilhelmus. "Soil nitrogen dynamics and spring wheat (Triticum aestivum) production in different cropping systems in the Swartland." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52455.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: Protein and oilseed production in the winter rainfall region of South Africa (primarily the Southern and Western Cape) is well below the potential for the area. One possible method of increasing production is to convince producers that the inclusion of protein and oilseed rotational crops will enhance the sustainability of wheat production systems. A project to investigate, quantify and elucidate the effect of canola (Brassica napus), lupins (Lupinus angustifolius) and medics (Medicago spp.) on subsequent wheat (

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31

Mbambo, Sifiso Walter. "Scales of variability of phytoplankton composition and biomass in Algoa Bay, South Africa." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9193.

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Includes bibliographical references<br>This study investigated the variability of environmental drivers of phytoplankton communities and biomass at different time scales in Algoa Bay. This research was motivated by Pacific oyster culturing at an Algoa Bay oyster farm. Time series of winds, sea surface temperatures (SSTs) and fluorescence were presented for the period from September/October 2010 to May/June 2012. The time series showed strong seasonal and interannual variability in the winds and SSTs. SSTs ranged from 12.5–25.5°C with a mean (±S.D.) of 18.4 ± 2.3°C. The dominance of south-easte

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32

Roux, Francis Augustus. "The influence of the composition of mixed Karoo vegetation on the grazing habits of Merino and Dorper wethers." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1003792.

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The primary objective of this research project was to determine whether area-selective grazing, by Dorper and Merino wethers, took place in small grazing camps as governed by differences in vegetal cover. The main research techniques employed were the descending-point method for the determination of botanical composition, sub-division of the camps into gridblocks to trace sheep movement in relation to vegetation patterning, fistulated animals to determine diet selection, the electronic theodolite for micro-topography, and few minor techniques. The result have shown that area- patch- and specie

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33

Muzangwa, Lindah. "Cover crop biomass production and effects on weeds and soil fertility in a maize-based conservation agriculture system." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/484.

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Low cover crop biomass production is a major obstacle to the success of conservation agriculture currently promoted as panacea to the inherent problem of soil erosion and loss of soil productivity in the Eastern Cape (EC). Therefore, this study evaluated cover crop management strategies for optimizing biomass production for better soil cover, soil nitrogen (N) and phosphorus (P) fertility, weed control and maize yields. The strategies tested are cover crop bicultures, selection of an adapted lupin cultivar and seeding rate, and the feasibility of rain fed winter cover cropping. The cover crop

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34

Mchunu, Sinethemba Euginia. "Distribution and stability of soil carbon in spekboom thicket, Eastern Cape, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20031.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Soils of semi-arid regions generally have low organic matter contents, primarily attributed to prevailing climatic conditions. Yet, the spekboom thicket, located in the semi-arid region of the Eastern Cape (South Africa) has been distinguished to accumulate large amounts of soil carbon. To further understand this remarkable accumulation, a detailed investigation was carried out to evaluate the distribution, speciation and stability of the soil carbon from directly beneath spekboom (Portulacaria afra) and other “nonspekboom”

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35

Folefoc, Asongbecap Daniel. "Geochemical study of soil salinity in a toposequence near Riebeeck West, South Africa." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/10448.

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Bibliography: leaves 84-91.<br>A geochemical investigation of salt distribution in soils of the semi-arid of Western Cape, South Africa, was carried out following a pilot study which revealed widespread soil salinity in the Berg River catchment. The present study looks at the distribution of the salts along a toposequence in a subcatchment of the Berg River underlain by Malmesbury Group shale. The objectives were: to investigate salt distribution in relation to landscape topography; to identify potentially harmful trace elements associated with the salinity; and to determine the processes resp

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36

Perridge, Allison. "Geophagic practices and geophagic soil nematode content in Thabo Mofutsanyane District, South Africa." Thesis, Bloemfontein : Central University of Technology, Free State, 2010. http://hdl.handle.net/11462/23.

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Thesis (M. Tech.(Biomedical Technology)) - Central University of Technology, Free State, 2010<br>Introduction: Geophagia, generally referred to as earth-eating, occurs in many countries of the world, including African countries such as South Africa. A need was identified to characterize human geophagic habits and the microbiological content of geophagic clayey soil, including the presence of potentially pathogenic nematodes (geohelminths), in South Africa. Materials and methods: Questionnaires were developed to generate data on human geophagia and included demography, socio-economics, indigen

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37

Dowding, Catherine Elaine. "Morphology, mineralogy and surface chemistry of manganiferous oxisols near Graskop, Mpumalanga Province, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16312.

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Thesis (MScAgric)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: In the humid Graskop region of Mpumalanga Province, South Africa, there is an anomalous body of highly weathered black, manganiferous oxisols derived from dolomite. With Mn contents as high as 17%, potential large-scale Mn release is an environmental concern under current, acid generating, forestry practices. This study aims at establishing the factors which may affect the stability of the manganiferous oxisols of Graskop and in the process, investigating some of the morphological, mineralogical and chemical proper

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38

Ros, Mesa Ignacio. "Stochastic modelling of soil carbon stocks under different land uses: a case study in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97097.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: The research was conducted in the Kwa-Zulu Natal midlands, South Africa. The vertical distribution of soil organic carbon (SOC) stocks were successfully predicted by stochastic exponential models developed for the three main land uses in the area, which are farmlands, forestry plantations and grasslands. These models, in combination with regular surface sampling, may be used for monitoring SOC dynamics in the area and mapping SOC stocks. Bulk density measurements are needed in combination with SOC content (%wt) to calculate suc

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39

Parwada, Cosmas. "Litter quality effects on soil stabiltiy and erodibility in the Ntabelanga Area, Eastern Cape, South Africa." Thesis, University of Fort Hare, 2017. http://hdl.handle.net/10353/4824.

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Soil organic matter (SOM) plays a primary role in aggregation and stabilization of soils, hence reducing their susceptibility to erosion. In South Africa (SA), most soils have low (< 4 percent) soil organic matte (SOM) contents, making them susceptible to soil erosion. Little is known about SOM quality effects in soil stabilization in the SA context, it is therefore difficult to advocate specific organic matter sources in order to stabilize a particular soil. This study evaluated effects of different litter quality sources (Vachellia karoo (sweet thorn) leaf litter and Zea mays (maize) stover)

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Van, Niekerk Christiaan Hermanus. "Past and present climates : owl pellet composition as an indicator of local climatic change." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52395.

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Thesis (MScAgric)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: During Holocene times a considerable deposit of barn owl pellet material accumulated in the Hot Pot Cave at De Hoop Nature Reserve on the southern coast of the Western Cape Province, South Africa. An excavation of this accumulation has yielded information on barn owl prey species over the past some two millennia. Four distinct layers were excavated and radiocarbon-dated to AD 381, AD 615, AD 991 and AD 1417. The micromammalian cranial contents of these layers were compared to material from two pellet collections t

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Prinsloo, H. P. "Alteration of the soil mantle by strip mining in the Namaqualand Strandveld." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1168.

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Trassierra, Jaqueline Anne. "Environmental drivers of the composition and distribution of larval fish assemblages off the south coast of South Africa." Thesis, Rhodes University, 2019. http://hdl.handle.net/10962/68154.

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The species composition, distribution and patterns of vertical migration of larval fish assemblages were investigated in March and in September 2013 within two adjacent log spiral bays, Algoa Bay and St Francis Bay, on the south coast of South Africa. Fish larvae were collected by means of a boat towed bongo net (57 cm diameter; mesh aperture 500 μm). An onshore (2 km) and an offshore (3 km) station were each sampled twice during the daytime (06:00 – 18:00) with two horizontal tows: near the surface (0.5 m) and close to the bottom (12 m). Tows were repeated at night (18:00 – 23:00) for onshore

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Kellerman, Millicent Johanna Susanna. "Seed bank dynamics of selected vegetation types in Maputaland, South Africa." Diss., Connect to this title online, 2004. http://upetd.up.ac.za/thesis/available/etd-02012005-090837.

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Ncube, Lindani. "Evaluation of the effective micro-organisms (EM) on soil chemical properties and yield of selected vegetables in the Eastern Cape, South Africa." Thesis, University of Fort Hare, 2008. http://hdl.handle.net/10353/86.

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Effective microorganisms (EM), a commercial concoction of microbes that includes yeasts, fungi, bacteria and actinomycetes, have been found to be effective in enhancing crop growth by a number of scholars. It is registered in South Africa, but it had not been thoroughly investigated. The present study investigated the effects of EM on growth, yield and quality of tomato (Lycopersicon esculentum Mill), butternut (Curcurbita moschata) and Swiss chard (Beta vulgaris), along with selected soil properties. In field-grown tomato it was observed that the application of EM caused a significant increas

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Garcia, Rivero Carlos. "The size and composition of the South African middle class : implications for a consolidating democracy." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/52024.

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Thesis (DPhil) -- Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: This study attempts to reach some conclusions about the possibility of the South African democracy to endure. It does so through entering into the so-called preconditions for democracy field, concretely, by the observation of the changes in and the composition of the South African middle class as a feature of democratic consolidation. Middle classes are regarded as an important political actor in democratisation and it is difficult to fmd a stable democracy without a well-developed and large middle class. Actually, t

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Witbooi, Bernadette M. (Bernadette Mary). "Potential of selected Karoo plant species for rehabilitation of old fields." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53012.

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Thesis (MSc)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: The passive recovery of old fields in the Karoo is a slow process, hampered by low and erratic rainfall, poor seed germination due to limited availability of suitable micro sites for seedling establishment, competition from existing vegetation, altered soil properties and the reduction of key soil biotic processes. The objectives of the study were to investigate the role of seed banks in the recovery of old fields, and to identify possible plant species and methods of establishing these species with the primary aim of

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Murungu, Farayi Solomon. "Evaluation and management of cover crop species and their effects on weed dynamics, soil fertility and maize (Zea mays L.) productivity under irrigation in the Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/335.

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The current interest in conservation agriculture (CA) technologies is a result of the need to reduce excessive land degradation in most crop producing areas as well as to enhance sustainable food production. Cover crops that are usually grown under CA to provide soil cover, may offer secondary benefits, depending on the farming system. The concept of growing cover crops is a relatively new phenomenon to smallholder farmers. Production of large biomass yields and weed suppression from cover crops were major challenges affecting success and uptake of CA technologies by smallholder irrigation far

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Richards, Michael Bruce. "Soil factors and competition as determinants of fynbos plant species distributions in the South-western Cape, South Africa." Doctoral thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/9670.

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Includes bibliographical references.<br>The Cape Floristic Region is one of the most species-rich regions of the world. Fynbos, the Mediterranean climate shrubland which comprises the largest part of this region, is characterized by high beta diversity and high edaphic endemism. However, very few quantitative studies of the factors controlling species turnover and community boundaries exist. I used an integrated approach of broad correlation techniques and detailed field experiments, to investigate this. The study site was a landscape on the southern slopes of the Soetanysberg hills, near Cape

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Hepburn, Colleen. "Composition and phenology of insect pests of Capsicum (Solanaceae) cultivated in the Makana District, Eastern Cape Province, South Africa." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005339.

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Capsicum baccatum var. pendulum was first grown in the Makana District in 2005. Extremely little was known about best practices for cultivation or the insects and diseases associated with the crop in this area. The study was conducted during the second year of production, November 2005 and November 2006, in an attempt to identify the composition and phenology of insects occurring on C. baccatum. In the more rural parts of the Eastern Cape, and more particularly in Grahamstown, there are very few industries. With the advent of this new agricultural venture, a processing factory has been opened

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Mndela, Mthunzi. "Evaluation of range condition, soil properties, seed banks and farmer's perceptions in Peddie communal rangeland of the Eastern Cape, South Africa." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1013153.

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South African rangelands in combination with their surrounding homesteads occupy 13% of the entire land surface in South Africa. These rangelands are a source of forage for communal livestock. The rangelands in communal tenure system are degraded due to high human population and livestock numbers. The rangeland of Peddie was never evaluated since the introduction of Nguni Cattle Empowerment Project. Therefore, socio-ecological evaluation was conducted in order to interlink farmer‟s perceptions and scientific data to recommend appropriate rangeland management and restoration programme. Two stru

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