1. College of Mechanical and Electronic Engineering，Nanjing Forestry University，Nanjing，Jiangsu 210037，China； 2. Productivity Promotion Center of Jiangsu Province，Nanjing，Jiangsu 210042，China
Abstract：A wind tunnel was built with an air speed in the range 0-6 m/s. The droplets containing fluorescein sodium were collected by carbon fiber rods in the vertical and horizontal directions. The content of fluorescein sodium was measured by using fluoremeter. The SPSS software was used to analyze influences of spray parameters and their interactions on spray drift. The results showed that nozzle type, pressure, spray medium and wind speed had a significant impact on droplet drift deposition. The influence of four experimental factors on the drift deposition from the most important to the least important is as follows: wind speed> nozzle type > spray medium >pressure. There are interactions between spray parameters, especially, spray medium and nozzle type, wind speed and nozzle type, wind speed and spray medium, spray medium and nozzle type and wind speed exhibit a substantial interaction, the interactions in the rest spray parameters are insignificant. At all sample positions, deposits on the collectors are reduced at lower wind speeds. However, the droplet drift is intensified as both pressure and wind speed increase. To reduce the drift, we should pay attention to the choice of wind speed in actual field pesticide spray operation. The drift retardant Greenwet 720 can control the drift effectively but the surfactant Greenwet X-100 increases the drift. Investigations into the mechanism of interaction effects of spray parameters on spray droplet drift are of great theoretical and practical significance to decrease of droplet drift, improvement of spraying operational efficiency, enhancement of pest control and reduction of environmental pollution.
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