Optimization of variables for maximizing efficacy and efficiency in aerial spray application to cotton using unmanned aerial systems

作     者：Juan Liao Ying Zang Xiwen Luo Zhiyan Zhou Yubin Lan Yu Zang Xiuyan Gu Weiming Xu Andrew John Hewitt 

作者机构：College of EngineeringSouth China Agricultural UniversityGuangzhou 510642China Key Laboratory of Key Technology on Agricultural Machine and Equipment(South China Agricultural University)Ministry of EducationGuangzhou 510642China National Joint Research Center for Precision Agricultural Aviation Application TechnologyGuangzhou 510642China The University of QueenslandGattonQueensland 4343Australia Guizhou UniversityGuiyang 550025China 

出 版 物：《International Journal of Agricultural and Biological Engineering》 (国际农业与生物工程学报（英文）)

年 卷 期：2019年第12卷第2期

页      面：10-17页

核心收录：

学科分类：08[工学] 082503[工学-航空宇航制造工程] 0825[工学-航空宇航科学与技术] 

基　　金：The authors acknowledge that this work was financially supported by the Science and Technology Plan of Guangdong Province of China(Project No.2017B090907031,2017B090903007,2015B020206003) Innovative Research Team of Guangdong Province Agriculture Research System(2017LM2153) 

主　　题：unmanned aerial system(UAS) unmanned aerial vehicle(UAV) unmanned electric helicopter(UEH) cotton defoliant aerial spraying parameter optimization 

摘      要：Aerial spraying can support efficient defoliation without crop *** the recent introduction to unmanned aerial system(UAS)for aerial spraying in China,there is a need to determine the optimum application variables to achieve high efficacy and efficiency with low *** present research involved field studies across two annual cotton production seasons in North Xinjiang,*** factors,including volume rate(A),tank mix including spray adjuvants(B),flight altitude(C),flight speed(D)and three levels of L9(3^(4))orthogonal arrays were carried out to optimize the application parameters for three types of *** included different numbers of rotors as follows:four-rotors,six-rotors and *** coverage,distribution uniformity(coefficient of variation(CV)of droplet coverage),rates of cotton defoliation and boll opening,application efficiency and cost were measured and *** showed that:(1)the rates of defoliation and boll opening by aerial cotton defoliant application could meet the requirement of cotton mechanized harvesting;(2)the optimal scenario for the three UASs was A_(3)B_(2)C_(1)D_(3),Volume rate(A3):48 L/hm^(2);Tank mix and concentration(B_(2)):(Tuotulong 225+Sujie 750+Ethephon 2250)mL/hm^(2),Flight altitude(C_(1)):1.5 m,and Flight speeds(D_(3))for unmanned helicopters with four-rotors,six-rotors and eight-rotors were 3.12 m/s,2.51 m/s and 3.76 m/s,*** results can provide guidance for cotton defoliant aerial spraying in China using UAS.