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对黄河中下游地区主要类型棉麦两熟棉铃主要品质性状与铃期日照时数时间分布关系的研究结果表明：铃重与铃龄２５～４０ｄ的日照时数关系密切，此时正值纤维加厚盛期和棉仁脂肪、蛋白质累积盛期；纤维长度与铃龄１５～２５ｄ的日照时数关系密切，此时正值纤维伸长盛期；与纤维强度关系密切的铃龄２５～４０ｄ和铃龄４０～４５ｄ分别是纤维加厚盛期和成熟期；纤维麦克隆值与铃龄 ２５～４０ｄ日照时数关系密切。主要时段日照时数与各品质性状的关系皆为显著或极显著的正相关关系。
The results showed that the relationship between the boll weight and the sunshine duration of 25 ~ 40 days of boll age was closely related to the relationship between the main quality characters of boll-cotton and bolls in the middle and lower reaches of the Yellow River during the period of sunshine duration. Thickening period and cottonseed fat and protein accumulation period. The fiber length was closely related to the sunshine hours of 15 ~ 25 days of boll age, at this time the positive value of fiber elongation was. At the age of 25 ~ 40 days, The boll age of 40 ~ 45 d were the thickening period and maturity of fiber, respectively. The value of fiber micronaire was closely related to the sunshine duration of 25 ~ 40 days of boll age. The relationship between sunshine duration and quality traits in the main periods were significant or highly significant positive correlation.