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该试验根据洛川旱原玉米不施肥的产量,将土地划为三等,其产量:低肥力地<300kg/亩,中肥力地300～450kg/亩和高肥力地>450kg/亩。结果表明玉米的N、P化肥最佳施用量低肥力地为N6.229kg/亩,P_2O_5 8.288kg/亩,N:P_2O_5=1:1.331,中肥力地为N5.636kg/亩,P_2O_5 5.35kg/亩,N:P_2O_5=1:1.16,高肥力地N为11.38kg/亩,P_2O_5 7.736kg/亩,N:P_2O_5=1:0.68,可获得玉米产量467～738.5kg/亩。
According to the yield of maize without fertilization in Luochuan, the test plot is divided into third class. The yield is lower than 300kg / acre, medium fertility: 300-450kg / acre and high fertility:> 450kg / acre. The results showed that the optimum application rates of N and P fertilizers were N6.229kg / mu, P_2O_5 8.288kg / mu, N: P_2O_5 = 1: 1.331, fertility N5.636kg / mu, P_2O_5 5.35kg / Mu, N: P_2O_5 = 1: 1.16, high fertility N of 11.38kg / mu, P_2O_5 of 7.736kg / mu, N: P_2O_5 = 1: 0.68, yield of maize 467 ~ 738.5kg / mu.