This research, the first year of a 3-year study, determined the ginning and fiber response of 11 varieties of cotton grown with the best available conventional and ultra narrow row (UNR) production practices. After harvesting, the cotton was ginned with the standard gin sequences recommended for spindle-and stripper-harvested cotton. For the analysis across production methods, the total foreign matter ranged from 10.3 percent for Fibermax 963 to 16.9 percent for Stoneville 373. With the exception of Stoneville 474, Suregrow 501, and Fibermax 819, HVI color grade indexes were about 94 (Strict Low Middling). Leaf grade ranged from a low of 2.3 for Deltapine 50 and Deltapine 5415 to a high of 4.1 for Stoneville 474. Neps per gram, short fiber content by weight and by number, and immature fiber content averaged 252.5, 7.4 percent, 199 percent, and 5.2 percent, respectively. Neps per gram ranged from 197 for DP 5111 to 333 for DP 50. Short fiber content (weight) ranged from 5.8 percent for Fibermax 819 to 9.7 percent for DP 50. Immature fiber content ranged from 3.9 for DP 5111 to 6.0 for SG 125. For conventional cotton, turnout averaged 35.2 percent and ranged from 32.5 percent for Deltapine 50 to 36.8 percent for Stoneville 373. For the stripper harvested cotton, foreign matter ranged from 16.1 percent for Stoneville 474 to 28.5 percent for Stoneville 373. Lint turnout averaged 30.5 percent and ranged from 28.7 percent for Deltapine 50 to 32.0 percent for Mycogen 556. All stripper-harvested samples were reduced for barkiness except Deltapine 5415, Suregrow 501, Stoneville 373, and Stoneville 474. Fibermax 819, DP 5111, and Suregrow 501 have the more desirable AFIS-quality related characteristics for both stripper and conventional harvest methods.
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