为探讨化学调控技术提高玉米产量的内在机理，研究了叶面配合喷施磷酸二氢钾和DA-6对玉米穗部性状和产量的影响，结果表明，叶面配合喷施DA-6和磷酸二氢钾使玉米秃顶长缩短，穗粗、行粒数、穗粒数增加，从而提高了产量。苗期喷施的效果好于抽雄期喷施，且以苗期喷施DA-6 75g/hm2、抽雄期追施磷酸二氢钾 3 750 g/hm2的处理穗部性状表现最好，折合产量最高，为12 762.44 kg/hm2，较对照不施生长素增产13.39%。

In order to investigate the internal mechanism of chemical control technology to improve the yield of corn， this paper study the effects of DA-6 and KH2PO4 cooperated spraying on the spike traits and yield of corn， to provide a theoretical basis for high-yield and high-efficiency of corn product. The result shows that DA-6 and KH2PO4 cooperated spraying on leaf surface could reduce the length of corn bald and increased spike， grain number， grains per spike， therefore increasing corn yield. The effect of seedling spraying is better than that of tassel stage spraying， and DA-6 75 g/hm2 spraying in seedling stage and KH2PO4 3 750 g/hm2 spraying in tasseling stage could obtain the best panicle traits performance， as well as the highest yield is 12 764.22 kg/hm2， which increased by 13.39%， compared to the control treatment(CK).

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国家科技计划(2015BAD22B01-05)、国家自然科学基金(31460323)部分内容。