BACKGROUNDUnmanned aerial vehicles (UAVs) are increasingly used in precision agriculture, particularly for pesticide application in rice cultivation. One challenge is off‐target pesticide drift, which raises environmental concerns and reduces pesticide efficiency. Lecithin adjuvants have been suggested to enhance droplet stability, reduce drift, and improve control efficacy. This study aims to evaluate the efficiency of lecithin adjuvants in reducing pesticide drift and improving deposition during UAV‐based pesticide application under various paddy field conditions.RESULTSThe addition of 1% lecithin adjuvants in 75% dosage of tricyclazole and ferimzone dual active ingredient formulations reduced off‐target drift by 2.62 to 3.16 times compared to the 100% and 75% dosage of standard formulations, with deposition efficiency along the spray path increasing by up to 155%. Wind direction and speed were found to be the primary environmental factor affecting deposition efficiency and drift rate. The control efficacy against leaf blast disease was significantly improved, with a maximum efficacy of 73.7% observed in the adjuvant‐treated group. Initial pesticide residues on rice plants were the highest in treatments with adjuvants, but their harvest products, brown rice and dried straw, were still within safe limits for human consumption.CONCLUSIONLecithin adjuvants significantly reduce off‐target drift and enhance pesticide deposition during UAV‐based application. This method allowed for lower pesticide dosages without compromising control efficacy, contributing to more sustainable agricultural practices. These findings highlight the potential of adjuvants to improve UAV pesticide application and reduce the environmental impact of pesticide use. © 2024 Society of Chemical Industry.

中文翻译：

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使用卵磷脂佐剂在基于无人机的应用中减少农药剂量和脱靶漂移，提高控制效果


背景无人驾驶飞行器 （UAV） 越来越多地用于精准农业，特别是用于水稻种植中的农药应用。一个挑战是脱靶农药漂移，这会引发环境问题并降低农药效率。卵磷脂佐剂已被建议用于增强液滴稳定性、减少漂移和提高控制效果。本研究旨在评估卵磷脂佐剂在各种稻田条件下无人机农药施用过程中减少农药漂移和改善沉积的效率。结果与 100% 和 75% 标准制剂的剂量相比，在 75% 剂量的三环唑和铁腥酮双重活性成分制剂中添加 1% 卵磷脂佐剂可将脱靶漂移减少 2.62 至 3.16 倍，沿喷雾路径的沉积效率提高高达 155%。发现风向和风速是影响沉积效率和漂移速率的主要环境因素。对叶瘟病的防治效果显著提高，在辅助治疗组中观察到的最大疗效为 73.7%。在用佐剂处理的情况下，水稻植株的初始农药残留最高，但其收获产品（糙米和稻草干）仍处于人类食用的安全限度内。结论卵磷脂佐剂在无人机施用过程中显着减少脱靶漂移并增强农药沉积。这种方法允许在不影响控制效果的情况下降低农药剂量，有助于更可持续的农业实践。这些发现突出了佐剂在改善无人机农药施用和减少农药使用对环境影响方面的潜力。 © 2024 化工学会.