《Table 1 Specifications of the unmanned aerial vehicle (UAV) and its carrying equipment》

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《Effect of UAV prewetting application during the flowering period of cotton on pesticide droplet deposition》

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Note:aD is actual distance measured by BeiDou，unit，km.

Two HB-Y-15L single-rotor electric UAVs（High Technology New Farming Co.，Ltd，Shenzhen，China），designated UAVXand UAVY，were used in spraying experiments.The UAV and spraying test sites are shown in Fig.1.UAVXwas used for water spray prewetting，and UAVYfor pesticide spraying operations.A light airborne BeiDou RTK differential system developed by South China Agricultural University with RTK differential positioning function was also used.The data acquisition interval was 0.1 s for recording flight parameters in real time and drawing actual operation trajectories as references for spray effect analysis.The specifications of the UAV and carrying equipment are listed in Table 1.