Abstract: Aimed to investigate the effects of Lifengling on lodging resistance and yield of machine-transplanted rice under waterlogging stress, two rice varieties, Quanyouhuazhan （hybrid varieties） and Lvyinzhan （Conventional high-quality varieties）, were used at this study. And the plant height, fresh weight, lodging index and yield were used to evaluated the effect of Lifengling on rice under waterlogging condition. The results showed under waterlogging condition the plant height of Lvyinzhan was siginificantly increased; The fresh weight of Quanyouhuazhan and Lvyinzhan were significantly decreased compared with normal water management, respectively. Under waterlogging stress, after application of Lifengling, the plant height of Quanyouhuazhan significantly decreased by 2.32%. Meanwhile, the lodging index was significantly increased and the rice yield was decreased under waterlogging condition. On the other hand, the lodging index of Quanyouhuazhan and Lvyinzhan were marked decrease 13.38% and 28.86% by spray application of Lifengling, respectively. And the yield of Quanyouhuazhan was significantly increased by 627.9 kg/hm², because of the increase of grain number and 1 000-grain weight. The yield of Lvyinzhan and its yield components increased unsignificantly. Therefore, timely and appropriate spraying of Lifengling could improve lodging resistance and ensure yield formation of rice under waterlogging stress.

Key words: Lifengling, waterlogging stress, lodging index, yield, machine transplanted rice