Efficacy evaluation and parameters optimization for cotton defoliant spraying using electric unmanned helicopter
Cotton harvesting,which is largely dependent on manual work,can benefit from mechanization for improving efficiency and solving the problem of labor shortage in many parts of the world.Cotton defoliation application is an important process supporting cotton harvesting.With high efficacy and efficiency and the avoidance of crop damage,aerial spraying has high potential for efficient cotton defoliant spraying.In the present study,in preliminary research,L16(45)four factors(dosage,cotton defoliant and adjuvant combination,electrostatic spraying,flight height)and four levels of orthogonal array was used for testing the feasibility and optimizing the parameters for cotton defoliant aerial spraying based on aircraft of YR-GSF06.In further research,L9(34)four factors(dosage,cotton defoliant and adjuvant combination,flight height,flight speed)and three levels of orthogonal array was used to optimize parameters for three aircraft of YR-GSF06,TAX and YR-AU 15.In order to acquire the optimal parameters of cotton defoliant aerial spraying,droplet deposit rate,coefficient of variation(CV)for spray deposition uniformity,cotton defoliation rate and boll opening rate,application efficiency and economic benefits were assessed.It was found that:(1)the rates of defoliation and boll openingwere improved significantly by cotton defoliant application,(2)the aerial spraying performed better than ground rig spraying in efficacy and efficiency,(3)the capacity of adsorption and penetration of droplet in cotton canopies was significantly improved by using spray adjuvants and electrostatic spraying,(4)the optimal scenario for three aircraft is A1B2C2D2: A1(dosage 40 L/ha),B2(combination Thidiazuron + Diuron + Vegetable Oil),C2(flight height 2.0 m),and D2 flight speed for TAX,YR-GSF06 and YR-AU 15 was 2.01 m/s,2.33 m/s and 2.79 m/s respectively.These results provide the theoretical basis for cotton defoliant aerial spraying in China using Unmanned Aerial Vehicle(UAV)rotary wing aircraft.
electrical unmanned helicopter cotton defoliant aerial spraying orthogonal test droplet deposit rate coefficient of variation adjuvant
Liao Juan Luo Xiwen Zang Ying Zhou Zhiyan Yubin Lan Xu Weiming Fu Wei Zang Yu Liu Wulan Gu Xiuyan
College of Engineering,South China Agricultural University/Engineering Research Center for Agricultu College of Engineering,South China Agricultural University/Engineering Research Center for Agricultu Guizhou University,Guiyang 550025 Shihezi University,Shihezi 832000,China
国内会议
广州
英文
130-141
2016-11-12（万方平台首次上网日期，不代表论文的发表时间）