The coupled effect for supplies of water and nutrients on maize was studied through an experiment of water and fertilizer factors with respective five levels in Changwu, Weibei rainfed tableland. Based on the empirical functions of maize yield ( Y ) and water consumption ( ET ) under different regimes of water and fertilizer supplies, the paper produced a maize water production function with dynamic optimal management of fertilizer supply, and clarified the characteristics of isograms of maize yield and...
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