Research On Droplet Deposition Distribution Of Plant Protection UAV In The Control Of Lotus Root Diseases And Insect Pests

With more and more problems solved by plant protection UAV instead of traditional manual and ground machinery in modern agricultural production and application,people’s demand for improving the work efficiency of UAV is also increasing.At the same time,the lotus root as an important aquatic vegetable in China urgently needs the more effective participation of plant protection UAV in the disease and pest control.Based on this condition,in order to improve the droplet deposition and work efficiency of plant protection UAV in the process of the disease and pest control of lotus root.This study detects the droplet efficiency after spraying with different nozzles and adjuvants by the water-sensitive paper method.And using three factors and three levels of orthogonal experiment design to select the better nozzle flow,operation height,and flight speed during the spraying operation.The influences of different nozzles,different adjuvants,and flight operation parameters on the deposition distribution and drift of spraying droplets on the surface of the lotus leaves are further discussed.The main research results are as follows:（1）Using the XR110-01VS nozzle can effectively improve droplet deposition and reduce droplet drift.The XR110-01VS nozzle used by plant protection UAV can increase the droplet diameter when spraying in lotus fields,and make the droplet diameter sizes more concentrated,which has the better effect on improving the droplet deposition in the target spraying area below the flight route.And it can be found that there is a certain relationship between the droplet deposition in the drift zone and the droplet diameter,meanwhile the droplets with large particle sizes are not easy to drift.When using the XR110-01VS nozzle,the deposition amount of spray droplets in the non-target spraying region can be relatively reduced.（2）Adding octadecenoic acid adjuvant can effectively improve the droplet deposition and reduce the droplet drift.When octadecenoic acid adjuvant was added to the plant protection UAV operation,the droplet diameter in the spraying area could be increased and the droplet diameter sizes were more concentrated.Compared with water spraying,adding adjuvants can all reduce the droplet deposition in the drift area,and increase the droplet deposition in the spraying area.Among them,octadecenoic acid adjuvant and methylated vegetable oil adjuvant can significantly reduce the deposition of spraying droplets in the drift area,and the drift is mostly concentrated near the spraying area,which has a good effect on resisting droplet drift.（3）Larger nozzle flow rate,moderate operating height and lower flight speed can better make spray droplets uniformly deposited on the surface of the lotus leaves.When using the plant protection UAV for spraying in lotus fields,setting the operating parameters as the nozzle flow rate of 3.0 L·min^-1,operating height of 2.0 m and flight speed of 2.0 m·s^-1,which can effectively improve the deposition of spray droplets on the surface of lotus leaves.On the face-bow of the blade,the primary and secondary factors affecting the droplet deposition effect are operation height,nozzle flow rate,and flight speed.On the back of the blade,the primary and secondary factors are flight speed,nozzle flow rate,and operating height.Based on the results of the above study,when the plant protection UAV was used for spraying in lotus fields,we recommend equipping it with an XR110-01VS nozzle,adding octadecenoic acid adjuvant,and setting the nozzle flow rate of about 3.0L·min-1,the operation height of about 2 m,and the flight speed of about 2.0 m·s-1 for spraying operation,which could effectively improve the deposition of pesticide droplets on the surface of the lotus leaves and improve the operation efficiency of plant protection UAV in lotus field.