Chinese Journal OF Rice Science >
Comparison of Droplet Deposition Characteristics in Rice Canopy and Benefit Between Unmanned Aerial Vehicle Spray and Artificial Spray
Received date: 2021-01-11
Revised date: 2021-04-03
Online published: 2021-09-10
【Objective】 The primary objective of this study is to elucidate the characteristics of droplet deposition and distribution by unmanned aerial vehicle (UAV) spray and artificial spray in rice canopy, and the control efficacy, grain yield and economic benefit were compared between UAV spray and artificial spray. 【Method】 The electricity-driven four-rotor UAV was selected and three flying heights and three pesticide dosages were set. The droplet deposition and distribution in rice canopy was measured at booting stage with UAV. Then the controlling efficacy of rice blast, grain yield and economic benefit were compared with those of artificial spray treatment. 【Results】 The results showed that the deposition amount of droplet was decreased with increasing flying height. The uniformity and penetrability of droplets were improved with increasing flying height. The deposition amount, uniformity and penetrability of droplets were improved with increasing pesticide dosage by UAV spray and artificial spray. The uniformity and penetrability of droplets were greater in upper canopy than in middle and basal canopy at the same flying height. The uniformity and penetrability of droplets by UAV spray were greater than those by artificial spray. The UAV spray obtained equivalent grain yield and control efficacy with the labor cost reduced by 165 Yuan/hm2, while net income and yield-cost ratio was improved by 164 Yuan/hm2 and 20.9, respectively. 【Conclusion】 Compared with the artificial spray, the UAV spray can raise working efficiency, reduce production cost and higher economic benefits are also achieved on the premise of grain yield, which has a potential to be widely applied for precise management and high yield and high efficiency cultivation in rice production.
Key words： rice; UAV spray; artificial spray; droplet; deposition characteristic; benefit
Yanda LI, Chun YE, Zhongsheng CAO, Binfeng SUN, Shifu SHU, Licai CHEN . Comparison of Droplet Deposition Characteristics in Rice Canopy and Benefit Between Unmanned Aerial Vehicle Spray and Artificial Spray[J]. Chinese Journal OF Rice Science, 2021 , 35(5) : 513 -518 . DOI: 10.16819/j.1001-7216.2021.210107
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