Comparison of the Effects of Chemical Topping Agent Sprayed by a UAV and a Boom Sprayer on Cotton Growth

In order to improve the spraying efficiency of cotton chemical topping agents, a field experiment was conducted compare effects 250 g·L?1 mepiquat chloride aqueous solutions sprayed by T30 unmanned aerial vehicle (UAV) and boom sprayer. The agronomic parameters, pesticide utilization rate, yield, fiber quality were determined. results showed that rates UAV sprayer 48.71% 30.37%, respectively. After 10, 20, 30, 40 days spraying, plant height inhibition two varieties 12.97%, 13.78%, 20.91%, 26.14% for Xinluzao 52 8.64%, 13.37%, 14.72%, 18.03% Huiyuan 720. with sprayer, 7.94%, 11.13%, 18.23%, 23.69% 6.09%, 9.98%, 11.78%, 15.14% 720 after spraying. agent shown have significant beneficial effect on rate pesticides, as well properties, cotton.