Jiang Tingting, Duan Jieli, Zhang Zhihong, Xie Bowei, Yang Zhou
College of Engineering, South China Agricultural University, Guangzhou, China.
Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China.
Pest Manag Sci. 2023 Dec;79(12):5116-5129. doi: 10.1002/ps.7713. Epub 2023 Sep 25.
The effective deposition of pesticide droplets on a target leaf surface is critical for decreasing pesticide application rates. The wettability between the target leaf surface and the pesticide spray liquid should be investigated in depth, with the aim of enhancing the adhesion of pesticide solutions. The wetting and deposition behavior of pesticides on target leaves depends on the properties of the liquid and the physical and chemical properties of the leaves. The physical and chemical properties of leaves vary with growth stage. This study aims to investigate the wetting behavior of banana leaf surfaces at different stages.
The microstructures and chemical compositions of banana leaf surfaces at different stages were studied using modern methods. The surface structure of banana leaves exhibited a wide variety of characteristics at different growth stages, and the chemical composition changed marginally. The surface free energy (SFE) and polar and non-polar components of banana leaves at different growth stages were measured by examining the contact angles (CA) of different test solutions on the surface of banana leaves. Previous research has suggested that changes in the CA and SFE correlate with changes in leaf surface wettability. In general, the new upper leaves of banana trees are composed of polar components and exhibit hydrophobicity. Non-polar components become dominant as the leaf grows. The back surface of banana leaves was non-polar at all growth stages, with a trend that was opposite to that of the front surface. The critical surface tension of the banana leaf surface at different growth stages ranged from 7.83 to 24.22 mN m , thus falling into the category of a low-energy surface.
The surface roughness and chemical characteristics of banana leaves affected the wettability of the leaf surface. Differences in the free energy and the polar and non-polar components of the leaf surface at were seen at different growth stages. This study provides a favorable reference for the rational control of pesticide spraying parameters and the enhancement of wetting and adhesion of the solution on banana leaf surfaces. © 2023 Society of Chemical Industry.
农药液滴在目标叶片表面的有效沉积对于降低农药施用量至关重要。应深入研究目标叶片表面与农药喷雾液之间的润湿性，以增强农药溶液的附着力。农药在目标叶片上的润湿和沉积行为取决于液体的性质以及叶片的物理和化学性质。叶片的物理和化学性质随生长阶段而变化。本研究旨在探究不同阶段香蕉叶片表面的润湿行为。
采用现代方法研究了不同阶段香蕉叶片表面的微观结构和化学成分。香蕉叶片的表面结构在不同生长阶段呈现出多种多样的特征，而化学成分变化不大。通过测量不同测试溶液在香蕉叶片表面的接触角，测定了不同生长阶段香蕉叶片的表面自由能（SFE）以及极性和非极性成分。先前的研究表明，接触角和表面自由能的变化与叶片表面润湿性的变化相关。一般来说，香蕉树新长出的上部叶片由极性成分组成，表现出疏水性。随着叶片生长，非极性成分占主导地位。香蕉叶片背面在所有生长阶段均为非极性，其趋势与正面相反。不同生长阶段香蕉叶片表面的临界表面张力范围为7.83至24.22 mN m，因此属于低能表面类别。
香蕉叶片的表面粗糙度和化学特性影响了叶片表面的润湿性。在不同生长阶段，叶片表面的自由能以及极性和非极性成分存在差异。本研究为合理控制农药喷洒参数以及增强溶液在香蕉叶片表面的润湿和附着力提供了有利参考。© 2023化学工业协会。
