[目的]对阿拉尔垦区早、中熟陆地棉品种(系)不同节位铃、不同开花时间段铃期、铃重、纤维品质空间分布特性加以研究探讨,为该区机采模式下获得优质陆地棉提供理论依据.[方法]对阿拉尔垦区4个早熟、中熟陆地棉品种(系)不同节位铃定点、定期挂牌、调查、考种、测试,总结铃期、及纤维品质性状变化规律.[结果]在高密植(26.4×104株/hm2)条件下,无论早熟、中熟品种(系)中下部果枝节位铃期较短、纤维长度和比强度较优；中上部果枝节位铃单铃重、衣分、整齐度和麦克隆值则优于下部节位铃；6月底到7月中旬开花形成的棉铃成熟度最好、纤维品质优异,是形成该区优质棉品级的主体部分.[结论]栽培上应采取适当降低第一果枝节位、确保中下部成铃的综合配套技术措施争取棉花优质.%[Objective] Distributions of boll-forming stages,boll weights and fiber quality traits ot early and medium maturing upland cotton varieties in high density-planting field were analyzed.The research provides theoretical basis for acquiring high quality upland cotton in Alar area of Xinjiang.[Method] The four varieties of early and medium maturing cotton growing in Alar area were used as testing materials.Cards were hung up regularly at the different nodes and investigation and testing were conducted to summarize the changing rules of boll weight,lint percentage and fiber quality traits.[Result]The results showed that under high density conditions (264,000/hm2),the bolls on middle and lower parts had shorter boll-forming stages,higher fiber length and better strength of both early-maturing varieties and middle-maturing varieties.However,the bolls on middle and upper parts had higher single boll weight,lint percentage,uniformity and micronaire than those on the lower parts.The cotton bolls that bloomed from late June to middle July matured the best with fine fiber,forming the principal part of high grade cotton in our region.[Conclusion] The technique in reducing the first fruit branch location that insures the bolls on middle and lower parts should be integrated in combination cultivation technique to increase high-quality cotton.
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