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Responses of Cotton in 2000 to Stress Associated with Treatment Levels of Insect Control, Irrigation, and Glyphosate

J. L. Barrentine, N. P. Tugwell, D. M. Danforth, O. C. Sparks, M. R. McClelland and T. G. Teague


 
ABSTRACT

Cotton fruiting patterns were evaluated at Marianna, AR, after treatment with glyphosate applied up to maximum labeled rates and, in a separate study, under different irrigation and insect management regimes with labeled and off-label rates. Boll retention was reduced by glyphosate applied within the label at 1 and 2 lb ai/A at the 3- to 4-leaf cotton stage and by a total of 4 lb/A during the season, but cotton compensated for fruit loss, and yield was not reduced. Glyphosate applied 'off label' (over-the-top at 7- to 8-lf cotton): did not affect preBflower square shed; increased shed of large bolls (> 9 days old), but not of small bolls (< 9 days old); resulted in delayed crop maturity as measured by higher NAWF (nodes above white flower), especially in plots with no early insect control; and reduced cotton yield, regardless of level of irrigation or insect control. Glyphosate applied early in the season evoked a crop response after first flower that could be detected with in-season monitoring using the COTMAN program.





Reprinted from Proceedings of the 2001 Beltwide Cotton Conferences pp. 1234 - 1236
©National Cotton Council, Memphis TN

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Document last modified XXXXXX, XXX XX 2001