植物生长调节剂对春玉米茎秆农艺性状及产量的影响

Effects of Plant Growth Regulator on the Stem Agronomic Characters and Yield of Spring Maize

以先玉335为试验材料，研究了植物生长调节剂对玉米茎秆农艺性状及产量的影响。结果表明：在玉米7—10展叶期间，喷施调节剂降低了玉米植株的穗位高度，随着喷施时期的推迟，株高逐渐降低、穗位逐渐升高，调节剂影响的基部节位逐渐上移；穗位以下节间缩短、增粗、穿刺强度增强，茎秆干重逐渐增加，植株重心下降；穗位以上节间拉长明显，茎秆干重逐渐降低。植物生长调节剂的增产效果较为明显，在试验设计范围内，于8展叶时施用化控剂“玉多十”较为适宜。

Taking Xianyu335 as experiment material, effects of plant growth regulator on the stem agronomic characters and yield of maize were studied. The results showed that plant growth regulator reduced maize ear height. With the delay of regulator application stage, the plant height gradually decreased, ear height gradually increased, influenced basal internode moved upward. The internodes below ear were shorter, thicker, stronger, the internodes above ear elongated obviously, the stem dry weight above ear gradually decreased, the center of plant gravity decreased. Plant growth regulator raised maize yield, and within the testing range, ＇ Yuduoshi＇ spraying at 8 leaf expansion was better.