Theses And Dissertations

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Browsing Theses And Dissertations by Subject "FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING::Plant production::Agronomy"

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    Remediation of Heavy Metals ( Cd and Pb) and Phthalate Easters in Contaminated Soil Treated with Composts.
    (University of Fort Hare, 2003-02) Sibali, Linda Lunga
    The availability of heavy metals (lead and cadmium) and phthalate esters ( dimethyl phthalate, diethyl phthalate and di-2-ethylhexyl phthalate) from artificially contaminated soil samples to which were added compost of different compositions, were measured weekly for 28 days. Heavy metals and phthalate esters were determined by atomic absorption spectroscopy (AAS) and gas chromatography (GC), respectively. Six different types of composts (C l-C6) were used for heavy metals whilst three different types of composts (Cl, C2 and C4) were used for phthalate esters. For heavy metals, the total metal sorption in composts changed with time and the changes were dependent on type of compost and its formulation. Generally, for all the composts used lead was highest on 7th day and cadmium on 14th day. The highest rate of compost appeared to give the most efficient fixing of the metals.
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    The Effects of Spring Debanking and Defoliation by Goats on Acacia Karroo Trees in the False Thornveld of the Eastern Cape, South Africa
    (University of Fort Hare, 2008-08) Macanda, Mfundo
    In the study the early flush phenophase induced response of A. karroo were investigated. The investigation was carried out in the False Thomveld of the Eastern Cape, a vegetation type that is dominated by A. karroo species and herbaceous layer dominated by Increaser II grass species. In the study two treatments were investigated; debarking and defoliation. A· simple randomized block design, with 6 treatments; replicated three times was set up. Debarking was done manually by hand and defoliation by 12 goats for two weeks in October 2004.