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Abstract
The quality indicators of cotton will change during storage. Taking the 5.89 million t of Xinjiang cotton from 2016 to 2021 as a sample, this paper analyzed the main fiber quality indicator data of warehouse-in and warehouse-out cotton for storage of 1.5, 3.0, 4.0, 5.0, 6.0, and 7.0 years. It was found that the color grade of cotton decreased with the extension of storage time. The cotton with storage time of 5.0 years mainly changed from white cotton grade 2 and white cotton grade 3 to light yellow stained cotton grade 1 and yellow stained cotton grade 1. Among them, the increase of light yellow stained cotton grade 1 was the largest, and the change to yellow stained cotton grade 1 was the largest at the storage 6.0-7.0 years. In addition, there were no significant changes in moisture regain, Micronaire value, upper half mean length, length uniformity index and fiber strength.