Effect of Chemical Topping with Flumetralin on the Canopy and Yield of Cotton in Southern Xinjiang

【Objective】The topping effect of flumetralin and the influence on the yield of cotton in Southern Xinjiang was studied in order to provide a theoretical basis for the realization of agricultural mechanization.【Method】Spraying flumetralin on cotton top at different times,and set- point surveying cotton growth characteristics. 【Result】Compared withmanual topping,the plant of chemical topping was higher and the number of fruit node was more than that of manual topping. There were no significant differences in fiber quality and cotton yield between chemical topping and manual topping. It was concluded that the chemical topping for the first time in June 20 th and second time in July 10 th and the first time in June 25 th and second in July 15 th were more reasonable in Southern Xinjiang. 【Conclusion 】Spraying flumetralin can effectively inhibit the growth of cotton top. It has a good prospect as a chemical topping agent in place of manual topping.