Effects of Chemical Topping Agent on Upland Cotton's Growth and Development

Abstract

[Objective]The aim was to spray the chemical topping agent to cap the upland cotton,and study its influences on the main traits of cotton plant. [Method]The chemical topping agent included A and B. Thereinto,A was produced by Zhejiang Hetian Chemical Co.,LTD.,its main component was 25% flumetralin; B,a emulsion in water( EW),produced by Xinjiang Gold Cotton Sciences and Technology Co.,LTD., its main components were mepiquat chloride,controlled release agent,and addition agent. Eight treatments were as follows: treatment 1,using A,spraying 1 200 g / hm2at June 15 first,spraying 1 800 g / hm2at July 5 second; treatment 2,using A,spraying 1 500 g / hm2at June 15 first, spraying 2100 g / hm2at July 5 second; treatment 3,using A,spraying 1 200 g / hm2at June 20 first,spraying 1 800 g / hm2at July 10 second; treatment 4,using A,spraying 1 500 g / hm2at June 20 first,spraying 2 100 g / hm2at July 10 second; treatment 5,using B,spraying 525 g / hm2 at July 5; treatment 6,using B,spraying 675 g / hm2at July 5; treatment 8,using B,spraying 525 g / hm2at July 10; treatment 8,using B,spraying 675 g / hm2at July 10. Topping artificially in July 10 was taken as the control. [Result]The chemical topping agent had inhibiting effects on the main stem's growth speed and leaf emergence rate of upland cotton; after spraying the chemical topping agent,the budding numbers,flowering numbers and boll numbers of the upland cotton were more than those of the control,so it had no inhibiting effects on these traits. [Conclusion]The study provides a theoretical basis for scientific use of the chemical topping agent during upland cotton production.

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