Objective Excessive application of pesticide has adverse impact on the quality and safety of agricultural products and ecological environment in China. It has become critical to optimize the pesticide spraying approach and improve the pesticide utilization and spraying effect.
Method Droplet size detection technology development and the relationship between droplet size and control effect were introduced based on the investigation on present testing methods of pesticide droplet size. The theory of optimum spraying droplet size was discussed. Method to determine optimum spraying droplet size and current research status were analyzed. Existing problems of optimum pesticide spraying droplet size were summarized. Suggestions were proposed for future research of spraying droplet size in agricultural aviation.
Result The optimum droplet size achieved from artificial surface is inconsistent with actual optimum size in real spraying operation. Artificial surfaces tend to collect only large droplets. Massive drift does not inevitably occur to small droplets. The optimum particle size of the spray is changing in different stages of the same target. A large number of experimental data have showed that small droplets were more easily adsorbed on the surface of target to kill pests by penetrating inside the plant canopy.
Conclusion The best spraying particle size varies very much for different pesticides, targets or liquid concentrations, even in different growth periods of pests. In the future, theoretical study on optimum pesticide droplet size should be strengthened from multi-angle macroscopic and microscopic analysis. In addition, precision controllable nozzles with variable diameter must be developed for agricultural aviation applications.
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