Abstract
Fibrogram theory indicates that short fiber content (SF) should be negatively related to the uniformity index (UI), defined as the ratio of the mean length to the upper half mean length expressed as a percentage. The correlation of SF and UI in a series of staple length standards was r = -0.95, which approaches unity. SF and UI were obtained on crop quality survey samples from 1984 and 1985 U.S. cotton crops. The correlation of SF and UI in these samples was r = -0.6 to -0.7. Correlations of SF or UI to fiber processing and yam quality measures were opposite in sign and of equal magnitude. Equations developed using stepwise regression techniques to predict man ufacturing waste, spinning potential, and yam strength indicate that UI is useful in predicting variation in these measures. These results suggest that UI, which is available on all cotton classed by high volume instrument systems, can be used instead of SF as an indicator of cotton quality.
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