Study on Deposition Characteristics of Spraying Droplet on Ligustrum lucidum by Plant Protection Unmanned Aerial Vehicle and Fruit Thinning Rate
Taking Ligustrum lucidum as the research object,plant protection unmanned aerial vehicle(UAV)Dajiang T30 was selected to spray 5%naphthylacetic acid(NAA)of 1.5 L/ha.The deposition density,deposition amount,uniformity,penetration of spraying droplet on Ligustrum lucidum by plant protection UAV and fruit thinning rate were analyzed under different spraying amounts(96.5,171.5 L/ha)and flight speeds(1.9,1.0 m/s),so as to provide reference for the application of UAV pesticide application technology in garden plants.The results showed that when the plant protection UAV sprayed 5%NAA of 1.5 L/ha with spray amount of 171.5 L/ha and flight speed of 1.0 m/s(treatment 2)at full flowering stage of Ligustrum lucidum,the deposition amount of droplets was higher than that of treatment 1(spray amount of 96.5 L/ha and flight speed of 1.9 m/s),and uniformity and penetration were better than those of treatment 1.Among them,feature tree 2 showed the best performance in general.The deposition densities of droplets in the upper,middle and lower layers were 32.40,51.75 and 39.13 droplets/cm2,the homogeneities were 39.1%,44.3%and 51.4%,the deposition amounts were 0.52,0.54 and 0.30 µL/cm2,respectively,and the penetration was 64.9%.The maximum fruit thinning rate was 58.5%at 30 d after application.
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