化学调控对玉米抗倒性及产量的影响

以高秆大穗型品种中单808为试验材料，研究不同种植密度下化学调控对玉米植株抗倒性及产量的影响。结果表明，在60 000株/hm²的密度下不发生倒伏；超过75 000株/hm²发生倒伏，倒伏率随种植密度的增加而增加。化学调控显著提高了玉米的抗倒伏能力,与对照相比，化学调控处理降低了拔节期至抽雄期玉米的株高，增加了地上部第3节间的粗度，显著增强了茎秆的抗拉弯强度和穿刺强度，降低了倒伏率。在密度为75 000 株/hm²以上时，化学调控处理显著增加了玉米的产量。

Effects of Chemical Regulation on Lodging and Yield of Maize

Zhongdan808 had been taken as material to study the effects of chemical regulation on maize lodging and yield under different densitys. According to the result, we knew that the lodging had not been happened under 60 000 plants/ha, but it happened under the density > 75 000 plants/ha , and the more population was, the higher lodging rates was. The chemical regulation treatment had increased the lodging resistant of Zhongdan808. It shortened the plant height(jointing to tassel) and ear position height, increased the diameter of the 3rd internode, improved the bending intension and puncture intension of stem compared with CK. The yield had been increased by chemical regulation under the density > 75 000 plants/ha remarkably.