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通过对陆地棉品种（系）田间不同取样期纤维品质变化的研究表明，纤维长度、纤维整齐度、纤维伸长率、麦克隆值和纤维比强度５项品质性状年度间存在着显著或极显著的正相关关系，亦即各品种（系）的纤维品质在年度间的变化趋势是一致的。６次取样中，各品种（系）的测试结果都有明显的峰值出现，并且各次取样的测试结果与其平均值都有一定的差异。即使同一次取样，各品种（系）的测试结果与其平均值的差异程度亦不同。在优质棉生产中，宜首先选用优质品种，并将其吐絮高峰调整在９月下旬至１０月上旬为宜。在棉花育种的品系预备试验和品系比较试验等试验中，为提高对纤维品质评选的准确性，应综合考虑其它农艺性状或增加取样次数，不宜只依据某一次取样的测试结果来断定某一品系纤维品质的优劣。
The study on the changes of fiber quality in upland cotton varieties at different sampling dates showed that there were significant or extremely significant differences among the five quality traits in the fiber length, fiber uniformity, fiber elongation, micronaire and fiber specific strength Of the positive correlation, that is, all varieties (lines) of the fiber quality trends in the year is consistent. 6 samples, the test results of all varieties (lines) have obvious peaks, and each sampling test results and the average value has a certain difference. Even if the same sampling, the test results of each variety (line) and the average difference between the different. In the production of high-quality cotton, should first select the high-quality varieties, and adjust the spit floc peak in late September to early October is appropriate. In order to improve the accuracy of the selection of fiber quality, we should consider other agronomic traits or increase the number of samplings in the trials of cotton breeding, such as the preparation of the line and the comparative test of the lines. It is not appropriate to conclude a certain line based on the test results of only one sampling The pros and cons of fiber quality.