[Objective] This study aimed at investigating the control effect of Chemical regulation on maize cultivated in different densities. [ Method] By taking maize hybrids Xundan 20,Zhongnongda 4 as materials,the effect of chemical regulationon the yield,yield component factors and plant morphology of the two hybrids planting in Huabei and the Northeast of China were studied,respectively. [Result] Chemical Yuhuangjin could control maize stalks,lower the plant height and the eat height,make intemodes below the spike more coarse and enhance its lodging-resist ance. In addition,chemical regulation could increase the optimum cultivation density by 7 500 plants/hm2 more than traditional cultivation. [ Con clusion] This paper provided theoretical reference for cultivating high-yield maize.%[目的]研究不同栽培密度下玉米化学调控的效果.[方法]以玉米杂交种浚单20和中农大4号为材料,分别研究了在华北、东北地区不同栽培密度下化学调控对玉米产量及产量构成因子和玉米株型的影响.[结果]“玉黄金”可调控玉米株型,使玉米个体的株高、稳位降低,使穗下部节间粗壮,使玉米的抗倒伏能力增强.化控处理辅助栽培可提高玉米的最适栽培密度,较传统栽培条件下提高了0.75万株/hm2左右.[结论]为玉米的高产栽培提供了理论依据.
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