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以中单909和浚单20为试验材料,研究乙矮合剂对不同密度夏玉米茎秆形态建成、抗折力、抗倒伏指数及产量的影响。结果表明,随密度增加,株高、穗位高、重心高度、节间长度、倒伏率呈升高趋势,而节间粗度、单位长度节间干重、抗折力及抗倒伏指数呈降低趋势,这些变化品种间存在差异。乙矮合剂处理显著降低株高、穗位高、重心高度,缩短节间长度、增加节间直径和单位长度节间干重,抗折力和抗倒伏指数提高,倒伏率降低;较高密度下(≥7.5万株/hm2),中单909和浚单20较各自对照增产幅度分别为3.77%~8.15%和6.73%~68.94%。综上所述,采用合理的种植密度并结合喷施乙矮合剂,能够提高抗倒伏能力和产量,可作为华北夏玉米区高产栽培的重要技术措施。
Taking Zhongdan 909 and Xundan 20 as experimental materials, the effects of B agent on the morphological characteristics of stems with different densities of summer maize, anti-stress, lodging resistance index and yield were studied. The results showed that the plant height, ear height, center of gravity, internode length and lodging rate increased with the increase of density, while the internode thickness, unit internode dry weight, flexural strength and lodging resistance index decreased Trends, there are differences between these varieties. B dwarfing agent significantly reduced the plant height, ear height, center of gravity, shorten the internode length, increase internode diameter and internode dry weight per unit length, and increase the anti-fracture ability and lodging resistance index. At higher density (≥ 7.5 million plants / hm2). The yields of Zhongdan 909 and Xundan 20 increased from 3.77% to 8.15% and from 6.73% to 68.94% respectively. In summary, using a reasonable planting density combined with spray B dwarfing agent can improve the lodging resistance and yield, can be used as an important technical measure of high yielding cultivation in the summer maize region of North China.