颁布单位：[University of the Free State] |  颁布时间：2009 |  实施时间：2009 |  学科分类：[["Dissertation, (M.Sc.Agric., (Soil,, Crop, and, Climate, Science))--University, of, the, Free, State,, 2009","Corn, --, Weed, control","Herbicides, --, Environmental, aspects","Tolerance","Temperature","Seed, size","Planting, depth","Maize, cultivar","Phytotoxicity","Clay, percentage","Acetochlor"]]

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颁布单位：[University of the Free State] |  颁布时间：2002 |  实施时间：2002 |  学科分类：[["Upward, mass, flow","Groundwater, nitrate, concentration","Shallow, water, tables","Dissertation, (M.Sc.Agric., (Soil,, Crop, and, Climate, Sciences))--University, of, the, Free, State,, 2002","Nitrates, --, Environmental, aspects","Groundwater, tracers","Hydrogeology, --, Methodology","Water, table"]]

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