Microbial activity and spray characteristics of dual fluid nozzles
Microbial pesticides are more environmentally friendly and safer than traditional chemical pesticides,which have become a research hotspot in the biological control of agricultural and forestry diseases and pests.However,due to the lack of effective-spraying technologies and specialized equipment,the use of traditional pesticide spraying noz-zles can greatly impact the effectiveness of microbial pesticides during large-scale pesticide spraying,limiting the ap-plication of microbial pesticides.At present,traditional nozzles are mainly sorted into conical spray nozzles and fan-shaped spray nozzles.Thanks to the flat spraying method of the fan shaped spray nozzle,the spray equipped with the nozzle is convenient for multi nozzle combination spraying microbial pesticides to achieve the purpose of precise spra-ying and large-scale spraying of microbial pesticides.Compared with conical spray nozzles,fan-shaped spray nozzles have lower activity of microbial pesticides after spraying,which cannot meet the requirements for large-scale uses.To ensure the activity of microbial pesticides after spraying,facilitate large-scale spraying efficiency and enhance spray performance,a dual fluid external mixed hydraulic fan type spray nozzle for spraying water and microbial pesticide mixture was studied.The activity of microbial pesticides can be evaluated by the activity of microbial pesticides after spraying(Rs).The spray performance of microbial pesticides included droplet size,droplet distribution uniformity and mixing uniformity,which were all passed evaluations of the effective size(μm),coefficient of variation(CV)and coefficient of uniformity variation(α),respectively.The preliminary analysis showed that the spray pressure of microbial pesticide and water must be kept at a certain ratio during the spray process of the dual fluid external mixing hydraulic fan spray nozzle(λ).When λ=0.7∶0.2,V=89.6％,the droplet size was within the effective range of 188-341 μm,and CV=0.40,α=0.47.At this time,it can ensure that the microorganism had high activity after spraying by the nozzle,and obtained ideal spray characteristics.The research results of this article would provide new research ideas and methods for the precise use of pesticides,large-scale spraying of microbial pesticides,and ensure the activity of biopesticides to effectively control plant diseases and pests.
water-pesticides dual fluid external-mixingflat-fan spray nozzleactivity of microbial pesticidesspray distribution uniformitymixing uniformity of microbial pesticides
万方数据
维普
