Abstract
Cotton fiber length distribution, especially short fibers, is an important property to the textile mill. When cotton of a given variety is processed at the gin on standard machinery, a statistically significant relationship exists between short fiber content (SFC) and uniformity index (UI). Two studies were conducted to evaluate the effects of different varieties of cotton and different types and levels of gin machinery on the relationship between SFC and UI. Twenty cotton varieties were evaluated using conventional gin machinery practices in one study. In another study, seven levels of machinery were evaluated along with two varieties and three moisture levels. Varietal effects dramatically influenced the SFC-UI relationship; differences of over 200% were predicted by regression equations for individual varieties as compared to an equation representing all 20 varieties. Differences of 29 to 47% occurred for predicted SFC when machinery levels differed. Correlation between SFC and UI exists; however, differences in length distribution are greatly affected by varietal and machinery differences and UI cannot be used to predict SFC with confidence.
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