颁布单位：[University of the Free State] |  颁布时间：1972 |  实施时间：1972 |  学科分类：[["Plant-soil, relationships","Crops, and, soils","Roots, (Botany)","Soil, --, Quality","Plant-water, relationships","Irrigation","Dissertation, (M.Sc..Agric, (Soil, Science))--University, of, the, Free, State,, 1972"]]

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