The experiment was carried out with random block design in the 2nd Fengshou Farm of Awat County in Xinjiang.The differences of yields,defoliation effects and fiber quality for spraying defoliant cotton were studied in the three machine harvesting cotton planting patterns with Xinluzhong No.75,R1〔(10 cm+66 cm+10 cm+66 cm+10 cm)+66 cm〕×11 cm,R2〔(12 cm+64 cm+12 cm+64 cm+12 cm)+66 cm〕×11cm,R3 〔(64 cm+ 12 cm+64 cm)+86 cm〕×9.5 cm.The ingredients of defoliant were the Dropp ultradisleave 300 g/hm2 and the 40％ Ethephon 1200 mL/hm2 .The results showed that compared with R1,R3 seed cotton yield and lint yield were increased by 796.5 kg/hm2 and 303.9 kg/hm2 ,R2 seed cotton yield was increased by 591.8 kg/hm2 .After spraying defoliant,compared with R1,R3's seed cotton yield and lint yield were increased by 823.3 kg/hm2 and 234.9 kg/hm2 ,R2 's seed cotton yield was in-creased by 656.0 kg/hm2 .After 24 days,the defoliation rate in R3 was 11.13％ higher and the hanging rate was 6.33％ lower than that of R1.There was no obvious difference in cotton fiber quality between differentcotton cropping patterns,but after spraying defoliant,the breaking ratio strength and the textile consis-tency index decreased.The textile consistency index of R3 planting model under spraying defoliation treat-ment was 18.0％ higher than that of R1.R3 was better than R2 and R1 in terms of the yield,the effect of defoliation and the fiber quality.In conclusion,R3 was more suitable for promotion in this area.%在新疆阿瓦提县丰收二场采用随机区组设计进行试验.研究了新陆中75号在一膜六行种植模式R1〔(10 cm+66 cm+10 cm+66 cm+10 cm)+66 cm〕×11 cm、一膜六行种植模式R2〔(12 cm+64 cm+12 cm+64 cm+12 cm)+66 cm〕×11 cm、一膜四行种植模式R3〔(64 cm+12 cm+64 cm)+86 cm〕×9.5 cm喷施脱叶剂(脱吐隆300 g/hm2+40％乙烯利1200 mL/hm2)前后棉花产量、脱叶效果以及棉纤维品质的差异.结果表明:R3模式较R1模式籽棉产量、皮棉产量分别增加796.5 kg/hm2和303.9 kg/hm2,R2模式较R1模式籽棉产量增加591.8 kg/hm2;喷施脱叶剂后R3模式比R1模式籽棉产量、皮棉产量分别增加823.3 kg/hm2和234.9 kg/hm2,R2模式较R1模式籽棉产量增加656.0 kg/hm2.脱叶剂喷施24 d后,R3模式下脱叶率较R1模式脱叶率高11.13％,挂枝率低6.33％.不同机采棉种植模式之间棉纤维品质差异不明显,但喷施脱叶剂处理后断裂比强度、纺织一致性指数降低.喷施脱叶剂处理下R3模式的纺织一致性指数较R1模式高18.0％.喷施脱叶剂对R3模式下棉花产量、脱叶效果及纤维品质影响最小且产量高,更适宜在生产中推广.
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