Jiang Yinlong, Yang Zhou, Xu Xing, Shen Dongying, Jiang Tingting, Xie Bowei, Duan Jieli
College of Engineering, South China Agricultural University, Guangzhou, China.
Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China.
Front Plant Sci. 2023 Jan 20;14:1079703. doi: 10.3389/fpls.2023.1079703. eCollection 2023.
Precision and efficient pesticide spraying is an important part of precision agriculture, banana is a large broad-leaved plant, with pests and diseases, has a high demand for spraying and pest control. The purpose of this study was to clarify the wettability of different pesticides on the banana leaf surface, and the effects of nozzle type and working parameters on the deposition distribution performance under air-assisted spray conditions. The wettability test results of different pesticides on banana leaf surfaces showed that the wettability of the adaxial side was always stronger than that of the abaxial side, the smaller the surface tension of the droplets, the better the wettability on the surface. The spray experiment was carried out on the previously developed air-assisted sprayer with the latest developed intelligent variable spray control system. Three types of nozzles were used to spray with different combinations of working parameters. The deposition distribution performance on the banana leaf surface was obtained by image processing using a self-compiled program. The experimental results show that the nozzle type, wind speed, and spray pressure have significant effects on the deposition distribution performance. Through the study of the interaction and coupling effect of nozzle type and working parameters on the spray droplet deposition distribution on both sides of banana leaves, the results show that under the conditions of hollow cone nozzle, 0.5Mpa spray pressure and 3-5 m/s wind speed, the spray coverage and droplet density are in the optimal state. This is mainly due to the low spray pressure and/or wind speed is not enough to make the banana leaves vibrate and improve the performance of pesticide deposition. excessive spray pressure and/or wind speed will cause large deformation of banana leaves and make them airfoil stable, which reduces the surface deposition performance. It is of great significance for promoting sustainable and intelligent phytoprotection.
精准高效的农药喷洒是精准农业的重要组成部分，香蕉是大型阔叶植物，病虫害较多，对喷洒及病虫害防治要求较高。本研究旨在阐明不同农药在香蕉叶片表面的润湿性，以及在风送喷雾条件下喷头类型和工作参数对沉积分布性能的影响。不同农药在香蕉叶片表面的润湿性测试结果表明，叶片正面的润湿性总是强于背面，液滴表面张力越小，在表面的润湿性越好。在先前开发的带有最新智能变量喷雾控制系统的风送喷雾机上进行喷雾试验。使用三种类型的喷头，以不同的工作参数组合进行喷雾。通过自编程序进行图像处理获得香蕉叶片表面的沉积分布性能。试验结果表明，喷头类型、风速和喷雾压力对沉积分布性能有显著影响。通过研究喷头类型和工作参数对香蕉叶片两侧喷雾液滴沉积分布的相互作用和耦合效应，结果表明，在空心锥喷头、0.5Mpa喷雾压力和3 - 5m/s风速条件下，喷雾覆盖率和液滴密度处于最佳状态。这主要是因为喷雾压力过低和/或风速不足以使香蕉叶片振动并提高农药沉积性能。过高的喷雾压力和/或风速会导致香蕉叶片大幅变形并使其气动力不稳定，从而降低表面沉积性能。这对于促进可持续和智能植物保护具有重要意义。
