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通过水、氮、钾3个因素的耦合作用,研究了对夏玉米产量效应的影响。结果表明:当灌水量2 700m3/hm2、施氮量270 kg/hm2、施钾量180 kg/hm2时,夏玉米产量最高,为12 053.32 kg/hm2。由三元二次回归方程得出,水、氮、钾的最佳用量为灌水量3 069 m3/hm2、施氮量285 kg/hm2、施钾量176.4 kg/hm2,最佳产量为12 111.6 kg/hm2;3个因素对产量影响的顺序为水>氮>钾。水氮耦合、水钾耦合对产量的影响显著,且均为正效应。
Through the coupling of three factors of water, nitrogen and potassium, the effect on the yield effect of summer maize was studied. The results showed that the yield of summer maize was the highest at 12 053.32 kg / hm2 when the irrigation water was 2700m3 / hm2, nitrogen application rate was 270kg / hm2, and potassium application rate was 180kg / hm2. According to the ternary quadratic regression equation, the optimum amount of water, nitrogen and potassium was 3 069 m3 / hm2, nitrogen application rate was 285 kg / hm2, potassium application rate was 176.4 kg / hm2, and the optimum yield was 12 111.6 kg / hm2. The order of the three factors affecting the yield was water> nitrogen> potassium. Water and nitrogen coupling, water and potassium coupling on yield significantly, and are positive effects.