农药液滴在植物枝叶表面润湿特性研究进展

Research progress in wettability of pesticide droplets on plant branches and leaves

目前用于农林业病虫害防治的农药液滴不能很好的粘附到靶标叶片表面上,导致农药投入量高,靶标针对性差,农药浪费严重,提高农药利用率的前提是掌握农药液滴在植物叶片表面上的润湿过程。从试验研究、理论分析和数值模拟这3个方面分析农药液滴在植物枝叶表面的润湿附着特性,阐述叶片表面形态和表面活性剂对农药液滴表面张力及接触角的影响,分析多尺度表面结构与农药液滴铺展的关系,综述计算流体力学(CFD)技术在预测农药液滴润湿特性领域的应用。现有文献中表明目前以重复试验为主的方法成本高、周期长,而数值模拟适用性广,是未来农林领域重要的研究方向,为与之匹配的喷雾设备研制和农药制备提供理论依据。

Nowadays,the pesticide droplets which are used for the control of agricultural and forestry diseases and insect pests cannot adhere well to the surface of the target leaf,resulting in high pesticide input,poor target targeting,however,the premise of improving pesticide utilization rate is to master the effect process of pesticide droplets on the plant leaf surface.The research includes three aspects:experimental research,theoretical analysis and numerical simulation,and analyzes the wetting and adhesion characteristics of pesticide droplets on the plant foliage surface.The effects of leaf surface morphology and surfactant on the surface tension and contact angle of pesticide droplets are analyzed.The relationship between the multi-scale surface structure and the spread of pesticide droplets is analyzed,and the application of computational fluid dynamics(CFD)technology in predicting the wetting characteristics of pesticide droplets is reviewed.From the known literature,it is shown that the existing method based on repeated experiments is costly and has a long cycle,but the applicability of numerical simulation is broad.It is an significant research direction in the field of agriculture and forestry in the future.It provides a theoretical basis for the development of matching spray equipment and pesticide preparation.