In order to construct an efficient identification system for drought resistance of cotton at different growth stages, 14 kinds of cotton widely planted in Northern Xinjiang were used as materials and evaluated by fuzzy subordination method in different water stress and different processing time. The results showed that drought resistance of the same cotton at different growth stages and under different water stress intensity was not completely identical. The cotton with stronger drought resistance was Xinluzao - 6 at seedling stage, Xinluzao - 35 and Jinmian - 13 at full bud stage, Xinluzao - 33 at flowering-boll stage, Xinluzao - 24 and 297 - 5 at boll-opening stage. Drought resistance of Xinluzao - 33 and Xinluzao - 31 was stronger in the whole life-cycle, and that of ZMS - 42 and Yinong - 2 was weaker. The optimal water stress intensity of comprehensive evaluation of cotton drought resistance at seeding stage, full bud stage, floweringboll stage and boll-opening stage were slight, slight, moderate and moderate, and the corresponding processing time was 15 d, 15 d, 5 d and 5 d. Finally, the model of stepwise regression equation for coefficient evaluation of cotton drought resistance was constructed on the basis of the optimal water stress degree and processing time.%以北疆棉区主栽的棉花为材料,通过模糊隶属函数法对各材料在大田不同生育期及不同水分胁迫强度下的抗旱性差异进行了综合评价,以建立不同生育期的棉花抗旱性快速评价体系.结果表明,不同胁迫强度及不同生育期的棉花抗旱性评价结果并不完全相同:苗期抗旱性强的棉花为新陆早33号,盛蕾期为新陆早35号、晋棉13,花铃期为新陆早33号,吐絮期为新陆早24号和297-5;新陆早33号和新陆早31号在整个棉花生长季抗旱能力较强,而中棉42和益农2号在全生育期抗旱能力较差;苗期、盛蕾期、花铃期和吐絮期的棉花抗旱性综合评价的适宜水分胁迫强度分别为:轻度、轻度、中度和中度,适宜水分胁迫强度下相应的水分胁迫适宜处理时间分别为15 d、15 d、5 d和5 d,并以适宜水分胁迫强度和处理时间为基础建立了大田棉花抗旱性快速、准确评价的回归分析模型.
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