Regulating Effect of 0. 004 0% Brassinolide AS on Rice

[Objective]The aim was to explore the regulating effect of 0. 004 0% Brassinolide AS on rice. [Method]Xiangzhaoxian No. 45 was used to study the different concentrations effect of brassinolide on rice growth and yield structure. [Result]The results showed that in the early tillering,booting and filling stage spraying Brassinolide increased rice height and rice panicles significantly; Total grains per panicle and real grains number per panicle were higher than that of the water control; Rice yield increasing reached a significant level. But spraying many times, did not help to improve the efficiency,so need to further study the best spraying period. [Conclusion]The study provides a reference for effective use of Brassinolide in rice production.