In the field of pesticide spraying, droplet size is one of the most important factors affecting droplet deposition and drift. In order to study the effect of different droplet size parameters on droplet deposition distribution and drift of aerial spraying by using plant protection UAV, aerial spraying test with the same spraying rate and different size droplets in rice canopy was carried out by using multirotor unmanned aerial vehicle (UAV) and four TEEJET nozzles with different orifice size (these droplets with a volume median diameter (VMD) of 95.21, 121.43, 147.28, and 185.09 μm, respectively). The deposition distribution and penetration of droplet in target area and the drift distribution of droplet in nontarget area were compared and analyzed. The results showed that the deposition distribution and penetration of droplets in the target area, as well as the drift distribution of droplets in nontarget area, were influenced by the droplet size. The droplet deposition rate in upper and lower rice canopy was increased in the target area with the increase of droplet size. The penetration results of droplets also increased with the increase of droplet size, and that of droplets with a VMD of 185.09 μm was the best, reaching 38.13%. The average value of the cumulative drift rate of droplets in rice canopy in the four tests was 73.87, 50.26, 35.91, and 23.06%, respectively. The cumulative drift rate and the drift distance of droplets decreased with the increase of droplet size, which indicated that the increase of droplet size can effectively reduce the drift of droplets. It demonstrated that the droplet size is one of the most important factors affecting droplet deposition and drift for pesticide spraying by plant protection UAV, and for the application of plant protection UAV with extra-low volume spraying, the use of droplets with VMD less than 160 μm should be avoided and a more than 10 m buffer zone should be considered downwind the spraying field to avoid the drug damage caused by pesticide drift. The results have fully revealed the effect of droplet size parameters on droplet deposition and drift of aerial spraying. Moreover, the influence of wind field below rotor on distribution of droplet deposition was surmised and analyzed from the perspective of plant protection UAV. It has an important reference significance for optimizing the droplet parameters of aerial spraying, increasing the spraying efficiency and realizing precision agricultural aviation spray.

Spraying Technology in Precision Agriculture Aviation

章节
发表日期：

2025年

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Yubin Lan

摘要

In the field of pesticide spraying, droplet size is one of the most important factors affecting droplet deposition and drift. In order to study the effect of different droplet size parameters on droplet deposition distribution and drift of aerial spraying by using plant protection UAV, aerial spraying test with the same spraying rate and different size droplets in rice canopy was carried out by using multirotor unmanned aerial vehicle (UAV) and four TEEJET nozzles with different orifice size (these droplets with a volume median diameter (VMD) of 95.21, 121.43, 147.28, and 185.09 μm, respectively). The deposition distribution and penetration of droplet in target area and the drift distribution of droplet in nontarget area were compared and analyzed. The results showed that the deposition distribution and penetration of droplets in the target area, as well as the drift distribution of droplets in nontarget area, were influenced by the droplet size. The droplet deposition rate in upper and lower rice canopy was increased in the target area with the increase of droplet size. The penetration results of droplets also increased with the increase of droplet size, and that of droplets with a VMD of 185.09 μm was the best, reaching 38.13%. The average value of the cumulative drift rate of droplets in rice canopy in the four tests was 73.87, 50.26, 35.91, and 23.06%, respectively. The cumulative drift rate and the drift distance of droplets decreased with the increase of droplet size, which indicated that the increase of droplet size can effectively reduce the drift of droplets. It demonstrated that the droplet size is one of the most important factors affecting droplet deposition and drift for pesticide spraying by plant protection UAV, and for the application of plant protection UAV with extra-low volume spraying, the use of droplets with VMD less than 160 μm should be avoided and a more than 10 m buffer zone should be considered downwind the spraying field to avoid the drug damage caused by pesticide drift. The results have fully revealed the effect of droplet size parameters on droplet deposition and drift of aerial spraying. Moreover, the influence of wind field below rotor on distribution of droplet deposition was surmised and analyzed from the perspective of plant protection UAV. It has an important reference significance for optimizing the droplet parameters of aerial spraying, increasing the spraying efficiency and realizing precision agricultural aviation spray.