豫西黄土丘陵区冬小麦化控抗倒伏试验研究

Study on Lodging-resistance by Chemical Control of Winter Wheat in the Loess Hilly Area of West Henan Province

豫西黄土丘陵区两年(1999～2001)的大田试验结果表明,冬小麦施用化学调控物质"壮丰安"具有显著的增产作用,增产幅度达到6.0%～10.8%,其中以小麦返青至拔节期叶面喷施的增产效果最为显著。"壮丰安"可以显著增强冬小麦的抗倒伏性能,其中播前拌种可以有效增加次生根数量,增强冬小麦抗根倒伏性能。不同施用方法均可以显著缩短基部第1、2、3节间的长度,总计达4.2～4.6cm,降低植株重心,增强小麦抗茎倒伏性能,但施用"壮丰安"对小麦株高无显著影响。

Field experiments were conducted in 2 a in the loess hilly area of west Henan Province. Results showed that the application of chemical regulator 'Zhuangfengan' on winter wheat could significantly increase the grain yields by 6.0%～10.8%, in which the effect of foliar spray in the period between regeneration and jointing stages was the most significant. The lodgingresistant features of winter wheat could be obviously strengthened by the application of 'Zhuangfengan'. Mixing the chemical into seeds before sowing could significantly increase the secondary root number and consequently boost up the rootderived lodgingresistant abilities. The application of 'Zhuangfengan' by the different studied methods could significantly reduce the length of the 1st, 2nd, and 3rd basic internodes of winter wheat stem by total 4.2～4.6 cm. The barycenter was therefore lowered and the stemderived lodgingresistant abilities were also improved. However, the height of wheat individuals was not influenced by the application of 'Zhuangfengan'. 