During pesticide spraying operations, the downwash airflow generated by the rotor UAV disperses the rice canopies with different wind vortex intensities, resulting in different degrees of morphological changes of rice sheaves in the target area. However, it is inconclusive whether it will affect rice yield. In this paper, dispersed canopy parameters and rice yield data through experiments of conventional flight operation and unconventional hovering operation were collected, aiming to conduct a comparative analysis of the effects of UAV wind vortex intensity on the morphology and yield of rice sheaves in the spraying operation. The results showed that in the conventional flight operation, the wind vortex had little effect on rice morphology and yield. Due to the influence of the short downwash airflow, the rice canopies were rapidly dispersed and produced a restorable canopy-vortex patch. After the UAV withdrew, the rice canopies recovered immediately. In the unconventional hovering operation, with the increase of vortex intensity, the rice canopies forged unrestorable canopy-vortex, which caused significant changes in rice morphology and eventually led to a yield reduction, of 1.21% at preliminary heading stage, 9.05% at full heading stage and 4.87% at mature stage. The experiments indicated that wind vortex did not affect rice during conventional plant protection, while the unrestorable canopy-vortex patch caused by the prolonged operational duration in unconventional hovering operation did affect rice morphology and yield, especially after the full heading stage.

在农药喷洒作业过程中，旋翼无人机产生的下洗气流以不同的风涡强度驱散稻冠，导致目标区域稻谷发生不同程度的形态变化。但是否影响水稻产量尚无定论。本文通过常规飞行作业和非常规悬停作业实验，收集分散冠层参数和水稻产量数据，旨在对比分析无人机风涡强度对喷雾作业中稻捆形态和产量的影响。 . 结果表明，在常规飞行作业中，旋风对水稻形态和产量影响不大。由于短下洗气流的影响，水稻冠层迅速分散并产生可恢复的冠层涡斑。无人机撤离后，稻棚立马恢复原状。非常规悬停作业中，随着涡流强度的增加，水稻冠层形成不可恢复的冠层-涡流，导致水稻形态发生显着变化，最终导致减产，前期减产1.21%，全抽穗减产9.05%阶段，4.87% 处于成熟阶段。试验表明，常规植保期间风涡对水稻无影响，而非常规悬停作业中作业时间延长造成的不可恢复的冠层涡斑对水稻形态和产量有影响，尤其是在全抽穗期后。稻冠立即恢复。非常规悬停作业中，随着涡流强度的增加，水稻冠层形成不可恢复的冠层-涡流，导致水稻形态发生显着变化，最终导致减产，前期减产1.21%，全抽穗减产9.05%阶段，4.87% 处于成熟阶段。试验表明，常规植保期间风涡对水稻无影响，而非常规悬停作业中作业时间延长造成的不可恢复的冠层涡斑对水稻形态和产量有影响，尤其是在全抽穗期后。稻冠立即恢复。非常规悬停作业中，随着涡流强度的增加，水稻冠层形成不可恢复的冠层-涡流，导致水稻形态发生显着变化，最终导致减产，前期减产1.21%，全抽穗减产9.05%阶段，4.87% 处于成熟阶段。试验表明，常规植保期间风涡对水稻无影响，而非常规悬停作业中作业时间延长造成的不可恢复的冠层涡斑对水稻形态和产量有影响，尤其是在全抽穗期后。造成水稻形态发生显着变化，最终导致减产，初抽期减产1.21%，全抽穗期减产9.05%，成熟期减产4.87%。试验表明，常规植保期间风涡对水稻无影响，而非常规悬停作业中作业时间延长造成的不可恢复的冠层涡斑对水稻形态和产量有影响，尤其是在全抽穗期后。造成水稻形态发生显着变化，最终导致减产，初抽期减产1.21%，全抽穗期减产9.05%，成熟期减产4.87%。试验表明，常规植保期间风涡对水稻无影响，而非常规悬停作业中作业时间延长造成的不可恢复的冠层涡斑对水稻形态和产量有影响，尤其是在全抽穗期后。