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通过播期、收获期、密度和氮肥运筹试验 ,采取回归和通径分析的统计方法 ,对淮北地区中晚熟、中大穗型玉米高产栽培途径进行了研究 ,结果表明 :麦收后争时抢播 ,从 6月 10日以后 ,每推迟 1d减产 6 6 .2 1kg/hm2 ;适当降低种植密度 ,由 8.2 5万株 /hm2 降至 5 .2 5万株 /hm2 ,产量将从 6 90 9kg/hm2 增至 92 19.0kg/hm2 ,5 .2 5～ 6 .0 0万株 /hm2 均可获得90 0 0kg/hm2 的产量 ;氮肥应超前施用 ,基肥和穗肥各占 5 0 %有利高产 ;苞叶变黄后推迟 10～ 15d待乳线消失后收获 ,可增产 16 .0 %左右 ,且能提高商品品质
Through sowing date, harvest date, density and nitrogen fertilizer operation, regression and path analysis were used to study the high-yielding cultivation methods of medium-late-maturing and medium-large-sized maize in Huaibei area. The results showed that: , From June 10 onwards, every postponed 1d production 6 6 .2 1kg / hm2; appropriate to reduce the planting density, from 82 50000 / hm2 to 52500 / hm2, the output will be from 6 909kg / hm2 increased to 92 19.0kg / hm2, 52.5600,000 plants / hm2 can be obtained 90 0 0kg / hm2 yield; nitrogen fertilizer should be advanced application, basal and ear spikes each accounted for 50% yield; Bracts yellowed postponed 10 ~ 15d until milk disappeared after harvest, can increase 16.0%, and can improve product quality