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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. |
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©National Cotton Council, Memphis TN |
Document last modified XXXXXX, XXX XX 2001
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