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Showing items 1 through 9 of 2.
  1. Library Resource
    Journal Articles & Books
    December, 2013

    The dominant modes of vegetation variability over Zimbabwe are investigated using principal component analysis (PCA) on National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (NOAA-AVHRR) normalized difference vegetation index (NDVI) monthly imagery from 1982 to 2006. Spectral analysis is also used to determine the periodicities of the component loadings. NDVI PCA-1 corresponds to the major vegetation types of Zimbabwe, and we demonstrated that grasslands and dry savannah have the strongest relationship with mean annual precipitation.

  2. Library Resource
    Journal Articles & Books
    December, 2013
    South Africa, Southern Africa

    Urban agriculture is potentially an important element of land reform and economic development programmes in South Africa. The social value of urban agriculture, such as improving food security, developing a sense of community and promoting ecological conservation, is well documented. But in order to effectively contribute to development agendas, urban agriculture must also present viable, sustainable economic opportunities. This study sets forth vegetable box schemes as a context-appropriate, economically feasible urban agriculture enterprise for which there is growing consumer demand.

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