颁布单位：[University of the Free State] |  颁布时间：2014 |  实施时间：2014 |  学科分类：[["Dissertation, (M.Sc., Sustainable, Agriculture))--University, of, the, Free, State,, 2014","Fertilizer","Small, scale, farmers","Fertilization","Extension, officer","Soil, sampling"]]

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