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  • n Ondersoek na sekere aspekte van grondsterkte in gronde van die Manganoserie
    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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  • Soils of the central Orange River basin
    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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  • Studies oor die toeganklike fosforstatus van sekere Vaalhartsgronde
    颁布单位：[University of the Free State] |  颁布时间：1971 |  实施时间：1971 |  学科分类：[["Phosphatic, fertilizers","Soils, --, South, Africa, --, Northern, Cape, --, Vaalharts","Soils, --, Phosphorus, content","Dissertation, (M.Sc.Agric., (Soil, Science))--University, of, the, Free, State,, 1971"]]
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  • The nutrient status of two soil forms of the Orange River development project
    颁布单位：[University of the Free State] |  颁布时间：1971 |  实施时间：1971 |  学科分类：[["Soils, --, South, Africa","Soils, --, Orange, River","Soils, and, nutrition, --, South, Africa","Soils, and, nutrition, --, Orange, River","Dissertation, (M.Sc.Agric., (Soil, Science))--University, of, the, Free, State,, 1971"]]
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  • Cationic equilibria in selected soils and soil materials
    颁布单位：[University of the Free State] |  颁布时间：1970 |  实施时间：1970 |  学科分类：[["Cationic, polymerization","Addition, polymerization","Soils","Thesis, (Ph.D, (Soil, Science))--University, of, the, Free, State,, 1970","Soil, materials"]]
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