颁布单位：[University of the Free State] |  颁布时间：2012 |  实施时间：2012 |  学科分类：[["Corn, --, Fertilizers","Corn, --, Nutrition","Foliar, feeding","Phosphatic, fertilizers","Potassium, fertilizers","Corn, --, Effect, of, potassium, on","Thesis, (Ph.D., (Soil,, Crop, and, Climate, Sciences, (Agronomy))--University, of, the, Free, State,, 2012"]]

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