高密条件下化学调控对夏玉米抗茎倒伏能力的影响

Effect of Chemical Regulation on Stalk Lodging Resistance of High-density Summer Maize

针对河北省高产夏玉米倒伏问题,以先玉335(XY335)和金海5号(JH5)为试验材料,通过设置6.75万,8.25万,9.75万株/hm2这3个密度梯度,研究了化学调控对玉米植株农艺性状、基部节间形态特征、力学性状、化学组分及产量的影响。结果表明,化学调控能显著降低植株高度、穗位、重心高度,缩短节间长度,增加节间粗度、降低长粗比值,显著增加茎秆可溶性糖含量、粗纤维含量和含钾量,同时基部节间硬度、抗折力和植株抗拉力值也显著提高,最终明显降低倒伏率。化控处理明显提高了高密条件下夏玉米产量。

The research has analysis the agronomic trait,basal internode morphological characteristics,mechanical characteristics,chemical constituents and yield of the maize under chemical treatment.Using the Xianyu 335 and Jinhai 5 as the research cultivar,set 67 500,82 500,97 500 plants / ha were designed to know the lodging of high yield summer maize in Hebei Province.The results showed that the chemical modifiers can significantly reduce plant height,ear length,high center of gravity internode diameter,internode diameter,long thick ratio,a significant increase of soluble sugar content,crude fiber content and potassium content while basal stem hardness,fracture resistance and tensile strength values of the plants also significantly increased,eventually significantly reduced lodging rates.Chemical control treatment significantly increased the yield of summer maize under density conditions.