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Assessment of spray deposition and losses in the apple orchard from agricultural unmanned aerial vehicle in China
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2018 ASABE Annual International Meeting 1800504.(doi:10.13031/aim.201800504)
Authors: Longlong Li, Yajia Liu, Xiongkui He, Jianli Song, Aijun Zeng, Wang Zhichong, Li Tian
Keywords: UAV, air-assisted orchard sprayer, spray deposition, spray loss, apple orchard
Field results showed that the effective spray swath width of the UAV was 2.23m, and the maximum droplet density of the central route was 132/cm2. The actual deposition in canopy of UAV was lower than that of orchard sprayer, but the normalized deposition was equivalent to orchard sprayer, and the coefficient of variation of deposition in all parts of tree was obviously higher than orchard sprayer. Due to the effect of the air flow produced by high-speed revolving rotors, the amount of spray drift in the air was much higher than orchard sprayer, whereas the ground loss was 1/5 of the orchard sprayer. Meanwhile, the rotor air flow of UAV causes a large amount of droplets to adhere to the fuselage, caused the amount of external contamination on the UAV was five times than that of the orchard sprayers.
Trials pointed out that the use of multi-rotor electric UAV for plant protection in orchard has a considerable influence on the spray drift and external contamination of the equipment. On the basis of these first data it will be possible to provide indications: a) plant protection UAVs should be sprayed at a reasonable height to reduce the drift in the air; b) to UAV manufacturers for the development of adequate spraying system as well as for an appropriate design of UAV for plant protection.(Download PDF) (Export to EndNotes)