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试验采用二次回归正交旋转组合设计 ,对四川盆地杂交玉米单作栽培的 4项密肥措施 ,即密度、氮肥、磷肥、钾肥 4因素进行研究。结果表明 ,密度对玉米产量影响最大 ;密度与钾肥之间存在着显著的互作效应 ;产量≥ 6 5 0 0kg/hm2 的优化栽培措施为 :种植密度为 5 5 2 2 2 .5～ 5 6 92 5 .0株 /hm2 ,施尿素 5 39.1～ 6 0 8.6kg/hm2 ,施磷肥(过磷酸钙 6 5 1.4～ 779.6kg/hm2 ) ,施钾肥 2 73.7～ 30 5 .4kg/hm
In the experiment, quadratic regression orthogonal rotation combination design was used to study the four factors of density, nitrogen, phosphorus and potassium in four monocultures of hybrid corn in the Sichuan Basin. The results showed that the density had the greatest effect on the yield of maize. There was a significant interaction between the density and the potash fertilizer. The optimal cultivation measures for yield ≥ 65 000kg / hm2 were as follows: the planting density was 5 5 2 2 2 .5 ~ 5 6 92 5 .0 plants / hm2, urea application 39.1 ~ 60 8.6 kg / hm2, application of phosphate fertilizer (SSP 6 5 1.4 ~ 779.6kg / hm2), application of potassium fertilizer 2 73.7 ~ 30 5 .4kg / hm