Bounce Behavior and Regulation of Pesticide Solution Droplets on Rice Leaf Surfaces

Pesticide spray droplets can damage ecological environments and negatively affect biodiversity if they reach nontarget areas. Effective retention of pesticide droplets on plant surfaces is an important challenge. In this study, a high-speed camera was utilized to visualize the bounce behavior of droplets of different pesticide solutions on rice leaf surfaces. We explored the addition of surfactants (SAAs) to different pesticide solutions and altered a pesticide solution system to prevent or regulate droplet bounce behavior. Experimental results indicate that the addition of SAAs to a pesticide solution can inhibit the bouncing of droplets on rice leaf surfaces. Additionally, a water-in-oil (EO) emulsion not only can significantly inhibit droplet rebound on a superhydrophobic surface, but also can quickly and automatically spread pesticide droplets to maximize the wetting area. Therefore, this work effectively improves the utilization of pesticides and reduces environmental pollution.

农药喷雾液滴若漂移至非靶标区域，会破坏生态环境并对生物多样性造成负面影响。实现农药液滴在植物表面的有效滞留，是一项重要的技术挑战。本研究采用高速摄像机，对不同农药药液液滴在水稻叶片表面的弹跳行为进行可视化观测。本研究通过向不同农药药液中添加表面活性剂（Surfactants, SAAs）并调控农药药液体系，探究了抑制或调节液滴弹跳行为的可行方法。实验结果表明，向农药药液中添加表面活性剂，可抑制液滴在水稻叶片表面的弹跳现象。此外，油包水型乳液（Water-in-oil, EO）不仅可显著抑制液滴在超疏水表面的反弹行为，还能快速自动铺展农药液滴以最大化润湿面积。综上，本研究有效提升了农药利用率，同时降低了环境污染。