抗倒丸对直播水稻植株生长的影响

EFFECT OF RETARDANT"LODGING-RESISTANT PELLET"ON PLANT GROWTH OF DIRECT SEEDING RICE

直播水稻施用以烯效唑为主要成分的抗倒丸，能增强抗倒能力，其原因有二：一是水稻植株节间缩短，株高降低，重心下移；二是植株茎壁增厚，机械组织发达。抗倒丸对直播稻的控长效应与施用量、施用时期和灌溉方式等有关。直播稻施用抗倒丸能降低植株高度，不论在水稻植株倒伏与否的情况下，均有利于机械化收割。

The retardant'Lodging-resistant pellet'made of S-3307 as main ingredient in use for direct seeding rice can strengthen lodging resistance of rice plants.This effect results not only from reducing internodal length and plant height and lowering plant centre of gravity,but also from increasing thickness of rice stem wall and promoting development of mechanical tissues.ffect of'Lodging-resistant pellet'on direct seeding rice in controlling plant height is related to application amount and application period of retardant and irrigating mode.Treating direct seeding rice with'Lodging-resistant pellet'can reduce plant height and so facilitate mechanical harvest whether rice lodging occurs or not.