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Published in Crop Sci 16:588-591 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Leaf and Bract Trichome Density and Boll-type Influence on Cotton Lint Grade Index1

D. F. Wanjura2, R. V. Baker2 and L. L. Ray3

Little quantitative information is available that relates physical cotton (Gossypium hirsutum L.) plant characteristics to lint grade for stripper harvested cultivars. In a 4-year study, the effect of varying levels of leaf and bract pubescence and degrees of boll compactness on lint grade index of hand-harvested seedcotton and burcotton were investigated. Leaf and bract trash, mechanically mixed in raw cotton after harvest, did not adhere to raw lint as tightly as trash incorporated by natural field weathering. Variations in growing season had more effect on lint grade index than specific plant characteristics. However, the following plant character effects were observed: (a) Increasing levels of blade trichome density (BTD) in leaves and bracts reduced lint grade index, (b) Maximum bur diameter was positively correlated with boll fluffiness index (BFI), (c) BFI was inversely related to grade index for lint obtained from burcotton. (d) Bur strength did not affect lint grade index. The results indicate that the bract attached to the bur is responsible for burcotton having lower lint grade indices than seedcotton.

Key Words: Cotton harveting • Cotton ginning • Boll fluffiness index • Bur diameter • Lint contamination

1 Contribution from the ARS, USDA, in cooperation with the Tex. Agric. Exp. Stn., Lubbock, Tex. Approved by TAES as Tech. Article No. 12102.

2 Agricultural engineers, Southern Region, ARS-USDA D. F. Wanjura is at Texas Agric. Exp. Stn., Lubbock, Tex., and R. V. Baker is at the South Plains Cotton Ginning Research Laboratory; Lubbock, Tex.

3 Professor, Texas Agric. Exp. Stn. at Lubbock, TX 79401.

Received for publication November 3, 1975.




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