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Comparison of Conventional and Breeder Sample Methods for Fiber Quality Parameters

J. Clif Boykin and John B. Creech

ABSTRACT

Two methods for sampling cotton variety trial plots were compared in this test on 38 cultivars grown in an early maturing variety test and 27 cultivars grown in a medium maturing variety test in three replications. Hand picked samples, consisting of 25 randomly chosen bolls from each plot, were taken before picking the entire plot by machine. The samples picked by hand were ginned on a laboratory saw gin and the whole-plot samples were processed through the microgin. All properties were more precise for the microgin samples than for the hand-picked boll samples. Gin turnout, Micronaire, uniformity, fiber length, strength, and seed index were overestimated by hand-picked boll samples, while reflectance, yellowness, leaf, and price were underestimated by hand-picked boll samples. There were trends between the microgin and hand-picked boll sample data for gin turnout (lint percent), fiber length, micronaire, strength, reflectance, yellowness, and seed index, but relative differences in cultivars were consistent between sample methods only for gin turnout, micronaire, and seed index. There was very little comparison between the microgin and hand-picked boll samples for uniformity, leaf, or lint value. Conventional results may be better predicted by using an improved protocol for hand sampling.





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Document last modified 04/27/04