Sampling for Lint Percentage and Fiber Quality in Cotton Yield Trials

L. Pinnamaraju, D.S. Calhoun, W.D. Caldwell, R.L. Hutchinson, D.J. Boquet, and S.H. Moore


 
ABSTRACT

In cotton yield trials, sub-samples are normally used to determine fiber properties and to estimate the proportion of lint in seed cotton harvested from plots. Several sampling methods are used for these purposes, but the effect of different sample methods on results obtained has not been closely studied. The purpose of this research was to determine the effects of sample method on estimates of lint percentage and lint yield, and on determination of fiber quality. Twenty two genotypes were grown at three Louisiana locations and sampled using two methods [hand picked boll samples (BS) and grab samples (GS) of spindle picked seed cotton]. Lint percentage from GS was determined in two ways : (i) ratio of lint weight to weight of lint + seed (L%BS) and (ii) ratio of lint weight to total sample weight (TOGS). Lint yield calculated from BS and from GS was similar, while that calculated from TOGS was 9% lower. A significant sample method x genotype interaction indicated that the relative yield performance of genotypes was significantly influenced by sample method. The effect of sample method on lint percentage was similar to that of lint yield, but no sample method x genotype interaction was observed. Sample method did not significantly effect values for fiber length, strength or micronaire. However, greater precision of fiber strength values was from GS compared to BS.



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pp. 618 - 620
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998