颁布单位：[University of the Free State] |  颁布时间：2001 |  实施时间：2001 |  学科分类：[["Soil, moisture, conservation, --, South, Africa, --, Free, State","Mulching","Maize, (Zea, mays, L.)","Sunflower, (Helianthus, annus, L.)","Dissertation, (M.Sc.Agric., (Agronomy, and, Horticulture))--University, of, the, Free, State,, 2001"]]

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