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水稻叶片表面独特的微纳米结构是造成农药雾滴在叶片上难以持留的主要原因,叶片上凝结的露水会改变叶片表面的微结构,从而对农药雾滴的沉积状态产生影响。针对这一问题分别进行了田间试验和实验室模拟试验,通过高速摄影以及农药沉积量试验研究没有露水、露水量较少和露水量多3种情况下,使用标准扇形喷头与防飘射流喷头进行喷雾时的农药雾滴沉积。试验结果显示,叶片上露水的存在能够增加农药雾滴的沉积并且影响显著,且不同喷头间存在显著性差异。高速摄影试验结果显示,露水的存在减少了雾滴的弹跳情况,农药雾滴在沉积过程中雾滴与叶片的直接作用变为农药雾滴与露水的作用,从而增加了沉积。
The unique micro-nano structure on the surface of rice leaves is the main reason that pesticide droplets are hard to be retained on the leaves. The condensation of dew on the leaves changes the microstructure of the leaf surface, which affects the deposition status of pesticide droplets. In response to this problem, field experiments and laboratory simulation tests were conducted respectively. Through high-speed photography and pesticide sedimentation volume test, no dew, less dew and dew were used, and standard fan nozzles and anti-bubble jet nozzles were used Pesticide droplets when spray deposition. The experimental results show that the presence of dew on the leaves can increase the deposition of pesticide droplets and has a significant impact, and there are significant differences between different spray heads. The results of high-speed photographic test showed that the presence of dew reduced the bouncing of droplets. The direct effect of droplets and leaves of pesticide droplets during the deposition process became the role of pesticide droplets and dew, thereby increasing the deposition.