| The nozzle diameter and the ejection pressure have a great effect on the flow rate,droplet cone shape,droplet size and cover area of fluid pesticide. According to the experimental data of droplet size, particle spectrum range ,droplet cone shape, flow rate ,cover area and cover area rate which obtained through changing the pressure of power sprayer and the nozzle diameter in greenhouse,this paper made comparative analysis on atomizing performance in same pressure and different nozzle type between same nozzle type and different pressure .The conclusion is that: the ejection rate and the droplet cone shape change with the variation of pressure and nozzle diameter,average particle diameter decreases obviously and particle quantity increases obviously with the increase of pressure and decrease of nozzle diameter. These results will lay experimental foundation for precise spraying,low pollution and highly effective operation. At the same time ,the fluid atomizing mathematical model of particle diameter and particle quantity were established,and also the analogy calculation of particle diameter and particle quantity were carried out. The feasibility is verified that the fluid atomizing mathematical model can make prediction on the atomizing performance of pesticide. These will provide scientific foundation and deinsectication technology for the development of precise agriculture.
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