群体调控对夏玉米抗倒伏性状指标的影响

以创玉198为试验材料,研究群体调控对夏玉米(Zea mays L.)抗倒伏性状指标的影响。结果表明,随着群体密度的增加,玉米倒伏率、株高、穗位高、穗位系数均逐渐升高;基部茎节间长增加,茎粗、茎粗系数降低;茎秆穿刺强度、单株茎秆干物重逐渐增加,茎秆抗折力先增加后降低;田间倒伏率增加,茎秆抗倒伏能力下降。得出创玉198玉米品种合理群体密度为6.00万~6.75万株/hm2,此群体结构有利于提高抗倒伏能力。

Effects of Population Regulation on Lodging Resistance Characters Index of Summer Maize

Chuangyu 198 was used as materials to study the effects of population regulation on lodging resistance characters index of summer maize. The results showed that lodging rate, plant height, ear height and ear height coefficient were in-creased gradually with the increasing of community density. The length of basal internode increased, but stem diameter, stem diameter coefficient decreased. The stalk penetrometer resistance, stalk dry matter weight per plant were increased gradually with the increasing of density, and the stalk mechanical strength was increased first and then decreased. The stalk lodging rates increased with the increasing of community density, leading to lodging resistance decrease. When the community density of maize chuangyu 198 was 60000 to 67500 plants per hectare, lodging resistance was increased because of the setup of reasonable structure.