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To study the effects of spraying machinery and pesticide combination on cotton defoliation, ripeness, yield and quality, in the hope of providing reference for the rational use of UAV defoliant for improving the quality and efficiency of machine-picked cotton. Experiments on the different spraying machines to spray cotton defoliation were carried out, different machine types, chemical combinations and other treatments were set up to analyze the differences in cotton defoliation rate, branch hanging rate, boll opening rate, etc. Under the same agent treatment, the elongation rate and branch hanging rate were shown as DJI T16 UAV> DJI T16 UAV> Locomotive DFH LX2204 and in terms of boll number per plant, lint, yield Micronaire value and elongation at break were XAG P30 UAV> DJI T16 UAV> Locomotive DFH LX2204. After adding the same anti-flying adjuvant, the defoliation rate …