喷施抗倒剂对玉米品种新科19生长发育及产量的影响

Effects of Spraying Lodging Resistance Agents on Growth and Yield of Maize Hybrid Xinke 19

为了摸清适合玉米的抗倒剂种类和喷施时期,以玉米品种新科19为材料,研究了5种抗倒剂（矮壮精、50％矮壮素、玉米小胖墩、矮丰·胺鲜乙烯利、玉米四宝）和5个喷施时期（七叶一心、八叶一心、九叶一心、十叶一心、十一叶一心）对新科19形态指标和产量的影响.结果表明,喷施抗倒剂较对照（喷清水）能明显降低新科19的株高、穗位高,缩短第3、5节间平均长度,增加第3、5节间平均茎粗,提高产量.其中喷施玉米四宝产量最高,分别比其余4种抗倒剂增产0.2％～0.9％;抗倒剂在玉米9片叶时喷施产量最高,比对照产量提高18.9％.

In order to investigate the lodging-resistant agents suitable for maize and their spraying stages,Xinke 19 was used as material to study the effects of five lodging-resistant agents and five spraying stages on the morphological indexes and yield of Xinke 19.The results showed that the application of lodging-resistant agents could shorten the plant height,the ear height and the mean length of third and fifth internodes,but increase the mean diameter of third and fifth internodes and the grain yield.The lodging-resistant agent ＂Maize Sibao＂ increased the yield of Xinke 19 by 0.2%-0.9% compared with the others.The best spraying time was at nine-leaf stage,the yield of which was 18.9% higher than the control（spraying water only）.