颁布单位：[University of the Free State] |  颁布时间：2003 |  实施时间：2003 |  学科分类：[["Thesis, (Ph.D., (Soil, Science))--University, of, the, Free, State,, 2003","Soil, moisture, --, South, Africa, --, Eastern, Cape","Waterlogging, (Soils), --, South, Africa, --, Eastern, Cape","Soils, --, Color, --, South, Africa, --, Eastern, Cape"]]

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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：[["Conservation, tillage","Compaction","Crop, residue","Crop, rotation","Faba, bean","Grain, yield","Nutrient, uptake","Wheat","Wheat, --, Ethiopia, --, Yields","Cropping, systems, --, Ethiopia","Crop, residue, management, --, Ethiopia","Thesis, (Ph.D., (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：2000 |  实施时间：2000 |  学科分类：[["Lesotho, benchmark, soils","Phosphorus","Retention, capacity","Retention, index","Buffering, index","Requirement, factor","Incubation, period","Soil, properties","Fertility, management","Soil, biochemistry, --, Lesotho","Phosphorus, in, agriculture, --, Lesotho","Phosphatic, fertilizers, --, Lesotho","Thesis, (Ph.D., (Soil, Science))--University, of, the, Free, State,, 2000"]]

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颁布单位：[University of the Free State] |  颁布时间：1984 |  实施时间：1984 |  学科分类：[["Potassium, fertilizers","Irrigation","Thesis, (Ph.D., (Soil, Science))--University, of, the, Free, State,, 1984"]]

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颁布单位：[University of the Free State] |  颁布时间：1971 |  实施时间：1971 |  学科分类：[["Soil, science","Soils","Thesis, (Ph.D., (Soil, Science))--University, of, the, Free, State,, 1971"]]

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