颁布单位：[University of the Free State] |  颁布时间：2019 |  实施时间：2019 |  学科分类：[["Phosphorus, fractions","Straw, disposal","Tillage, method","Weed, control","Wheat, residues","Dissertation, (M.Sc., (Soil, Science))--University, of, the, Free, State,, 2019"]]

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颁布单位：[University of the Free State] |  颁布时间：2001 |  实施时间：2001 |  学科分类：[["Nitrogen, fertilizers","Corn, --, Fertilizers","Soils, --, Nitrogen, contents","Dissertation, (M.Sc., (Soil, Science))--University, of, the, Free, State,, 2001"]]

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颁布单位：[University of the Free State] |  颁布时间：1991 |  实施时间：1991 |  学科分类：[["Dissertation, (M.Sc., (Soil, Science))--University, of, the, Free, State,, 1991","Irrigation","Soil, structure"]]

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颁布单位：[University of the Free State] |  颁布时间：1988 |  实施时间：1988 |  学科分类：[["Soil, moisture","Mathematical, models","Plant-water, relationships","Plants","Plant-soil, relationships","Dissertation, (M.Sc., (Soil, Science))--University, of, the, Free, State,, 1988"]]

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