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ARS Home » Southeast Area » Dawson, Georgia » National Peanut Research Laboratory » Research » Publications at this Location » Publication #200381
Title: Effect of weed management on quality of Roundup Ready Flex cotton

Author
item HAAS, J - AUBURN UNIVERSITY
item PATTERSON, M - AUBURN UNIVERSITY
item MONKS, C - AUBURN UNIVERSITY
item Faircloth, Wilson

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/23/2006
Publication Date: 7/15/2006
Citation: Haas, J.K., Patterson, M.G., Monks, C.D., Faircloth, W.H. 2006. Effect of weed management on yield and fruiting position of Roundup Ready Flex cotton. Weed Science Society of America Meeting Abstracts. 59:85.

Interpretive Summary: none required.

Technical Abstract: Roundup Ready Flex cotton will be commercially available to growers in 2006. Alabama growers need information about this new technology under their growing conditions and weeds. Field trials were conducted at the Prattville Experiment Field, Prattville, AL and the Field Crops Unit, Shorter, AL in 2005 to evaluate the effect of different weed management systems on yield and fruiting position of Roundup Ready Flex Cotton. Individual treatments consisted of Round up Weather Max (RWM) at a rate of 0.9lbs ai/ac either alone, used with a pre-emergence, or tank mixed with other post herbicides: Three different treatments of Round up Weather Max at a rate of 0.9lbs ai/ac at weed growth stages of 2-3”, 4-6”, and 7-9”. RWM tank mixed with different insecticides and growth regulators. Cotoran applied pre followed by (fb) RWM + Staple at 2-3” weeds fb RWM at 4-6” weeds. Cotoran + Staple pre fb RWM at 2-3” weeds. RWM at 2-3” weeds fb Envoke + NIS fb RWM at 2-3” weeds. RWM + Staple at 2-3” weeds fb Envoke + NIS at 2-3” weeds fb RWM at 2-3” weeds. RWM + Dual Magnum at 2-3” weeds fb Envoke + NIS at 2-3” weeds. Prowl pre fb RWM at 2-3” weeds. Treatments were applied to plots 4 rows (36 in) and 25 ft long in a spray volume of 15 gpa. Treatments were replicated four times. Box mapping was done from 10 ft of the middle right row of each plot. Seed cotton yields varied from 754 lbs/ac to 3654 lbs/ac at Prattville and from 1420 lbs/ac to 3130 lbs/ac at Shorter. Overall yields at both locations were similar except for the delayed application of glyphosate at Shorter which was lower than at Prattville. Delayed weed control tended to reduce yields by decreasing boll counts and weights at node 7. Although boll counts and weights varied at different nodes due to the treatments, the cotton compensated for this by producing bolls at higher nodes. The data shows that the addition of Staple to the glyphosate fb Envoke appeared to adversely affect yield and fruiting at both locations. Cotoran pre fb glyphosate did not adversely affect yield or fruiting at either location.