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：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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