National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology (NPAAC), College of Engineering, South China Agricultural University, Guangzhou, China.
Department of Biological and Agricultural Engineering, Texas A&M University, College Station, Texas, USA.
Pest Manag Sci. 2019 Jun;75(6):1546-1555. doi: 10.1002/ps.5321. Epub 2019 Feb 14.
Unmanned aerial vehicles (UAVs) are a recently developed aerial spraying technology. However, the effect of spray volume variation on deposition and pesticide control efficacy is unknown. The effect of three UAV spray volumes (9.0, 16.8 and 28.1 L ha ) using three different nozzle sizes on droplet deposition and wheat aphid and powdery mildew control efficacy was assessed. An electric air-pressure knapsack (EAP) sprayer was used as a comparison.
Different spray volumes significantly influenced the deposition and control efficacy of the UAV and EAP. For the UAV, a low spray volume of 9.0 L ha with a fine nozzle (nozzle LU120-01) resulted in lower deposition and control efficacy. Optimal control efficacy was achieved with coarser nozzles (nozzles LU120-02, -03) at > 16.8 L ha volume with systemic insecticide, and at 28.1 L ha with contact insecticide and fungicide. For EAP, a high spray volume led to run-off, and a spray volume of 225 L ha achieved better deposition and control efficacy.
The UAV had comparable deposition and efficacy control to the EAP at a higher spray volume (> 16.8 L ha ) with coarse nozzles, but exhibited inferior deposition and efficacy control at a lower spray volume (<9.0 L ha ) with fine nozzles. © 2019 Society of Chemical Industry.
无人机（UAV）是一种新兴的空中喷雾技术。然而，喷雾量变化对沉积和农药防治效果的影响尚不清楚。本研究评估了三种不同的无人机喷雾量（9.0、16.8 和 28.1 L/ha）和三种不同的喷嘴尺寸对雾滴沉积及小麦蚜虫和白粉病防治效果的影响。同时，使用电动压力背包喷雾器（EAP）作为对照。
不同的喷雾量显著影响了无人机和 EAP 的沉积和防治效果。对于无人机，采用细喷嘴（喷嘴 LU120-01）、低喷雾量 9.0 L/ha 导致沉积量和防治效果较低。当使用系统杀虫剂时，最优防治效果是在 >16.8 L/ha 的体积和较粗的喷嘴（喷嘴 LU120-02、-03）下实现的，而接触杀虫剂和杀菌剂时则需要 28.1 L/ha 的喷雾量。对于 EAP，高喷雾量会导致径流，而 225 L/ha 的喷雾量则可获得更好的沉积和防治效果。
当使用较粗的喷嘴时，UAV 的沉积量和防治效果与 EAP 相当，喷雾量高于 16.8 L/ha；而当使用较细的喷嘴时，UAV 的沉积量和防治效果则不如 EAP，喷雾量低于 9.0 L/ha。© 2019 英国化学学会。
