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The Suitability of Maize as a Bio-ethanol Crop in south africa

Journal of Environmental Science and Engineering 2011年第6期5卷 742-752页

作者： M. Smith N. Kotze Department of Geography Environmental Management and Energy Studies University of Johannesburg Johannesburg 2006 South Africa

Biofuels could contribute, on a worldwide basis, to the attainment of international energy-policy objectives in three ways： by reducing dependence on imported oil; by increasing the availability of renewable energy sources; and by addressing environmental issues. It is an absolute necessity in south africa.to utilise sustainable and renewable energy sources, such as biofuels, but the production of bio-ethanol will ultimately place pressure on the limited and fragile agricultural resources of the country. Because of the proposed bio-ethanol plant at Bothaville this paper will firstly develop a methodology suitable for south africa. conditions in order to establish whether agricultural crops could be used for the production of biofuels. Secondly, it probes the suitability of maize as a biofuel crop in this country by investigating four possible bio-ethanol potential scenarios which are qualitatively formulated to provide a comprehensive overview of this study. Only in the best-case scenario could maize produce the required volumes as set out by the south africa. government for 2013.

关键词： Biofuels energy crop maize food security south africa.

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Influences of Seed Source, Pre-chilling, Light and Temperature on the Germination of south africa. Pelargonium sidoides

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Journal of Agricultural Science and Technology 2010年第3期4卷 18-23页

作者： F. B. Lewu D. S. Grierson A. J. Afolayan Private Bag X 1001 Department of Agriculture University of Zululand Kwa-Dlangezwa 3886 South Africa Private Bag X 1314 Department of Botany University of Fort Hare Alice 5700 South Africa

Pelargonium sidoides DC is used in herbal medicine for the treatment of various infections. The roots are being indiscriminately harvested for local and export trade and the collection rate is becoming unsustainable. Seed germination dynamics of this species was studied with the aim to reveal factors that influence its survival in the wild in order to adopt the appropriate germination conditions for use in ex-situ propagation and conservation program. Germination was affected by age of seeds, temperature and pre-chilling conditions. Temperature higher than 25 oC reduced germination by 60%. When seeds of P. sidoides were subjected to pre-chilling treatment for seven days, there was a significant drop in final germination by 29% compared to the other treatments. Although, final germination was not affected by different light treatments, continuous light significantly promoted germination velocity Seeds harvested from the plants grown in the green house performed better in germination than those collected from the field. The ecological implications of these observations on the propagation and conservation ofP. sidoides are discussed.

关键词： Seed source ex-situ conservation medicinal plant Pelargonium sidoides seed germination south africa.

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