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《Journal of Forestry Engineering》 2018-01
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Effects of flat-fan nozzle wear on application of microbial pesticides

ZHAI Enyu;ZHENG Jiaqiang;ZHOU Hongping;RU Yu;LI Jianhua;College of Mechanical and Electronic Engineering,Nanjing Forestry University;  
Microbial pesticides have become the hotspot in biological control of agriculture and forestry diseases and insect pests because they have the advantages of no pollutant emission,no chemical residue,sustainable control,etc.However,the application of microbial pesticides is still limited because of the lowavailability,backward spraying technology and the lack of appropriate sprayer. In this paper,the correlation between the pesticide evaluation indexes( droplet size and deposition,and viability of microbial pesticides) of the biological activity and the orifice structure was analyzed; and the mutual relationship between these evaluation indexes was experimentally studied by using nozzle wear experiment system,droplet deposition and viability of microbial pesticides measurement system,3 D-admeasuring apparatus and laser diffraction particle analyzer. The mathematical models of the relationship between the size of spherical-top of flat-fan orifice and microbial pesticides activity were established. The results showed that the current assessment method for nozzle failure was not suitable for microbial pesticides application. In addition,the evaluation of microbial pesticides activity should take into account the influence of droplet deposition and viability of microbial pesticides. There exists a linear relationship between the spherical-top of flat-fan orifice and the droplet deposition and the viability of microbial pesticides. Accordingly,the microbial pesticides activity can be evaluated by the size of the spherical-top of flat-fan orifice. The results provide the foundation on howto assess nozzle failure during the application of microbial pesticides and howto treat plant pests and diseases effectively.
【Fund】: 江苏省高校自然科学研究面上项目(16KJB210006)
【CateGory Index】: S491
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