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ARS Home » Southeast Area » Dawson, Georgia » National Peanut Research Laboratory » Research » Publications at this Location » Publication #184831
Title: LIBERTY-LINK COTTON TRIALS IN ALABAMA

Author
item HAAS, JOHN - AUBURN UNIVERSITY
item PATTERSON, MICHAEL - AUBURN UNIVERSITY
item Faircloth, Wilson

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 1/3/2005
Publication Date: 7/1/2005
Citation: 1:2840.

Interpretive Summary: none required

Technical Abstract: Liberty-Link cotton, tolerant to the herbicide Ignite (glufosinate), was commercially available in 2004. Alabama growers need information about this new technology under their growing conditions and against their weeds. Field trials were conducted at the Tennessee Valley Substation, Belle Mina in 2003, and at the Prattville Experiment Field, Prattville, AL and the Wiregrass Substation, Headland, AL in 2003 and 2004 to evaluate weed control and crop yield with several Liberty-Link weed management systems. Individual treatments consisted of: Ignite applied at the 32 oz rate twice (3 L and 8 L cotton). Prowl 2 pts/A preemergence followed by (fb) Ignite applied twice; Prowl + Cotoran at 2.5 pts/A preemergence fb Ignite applied twice; Prowl pre fb Ignite at 3 L fb Ignite + Envoke 0.1 oz at 8 L; and Prowl preemergence fb Ignite at 3 L + Staple 1.0 oz at 8 L. A control (untreated) was included. Treatments were applied to plots 4 rows (36 to 40 in) and 30 ft long. Treatments were replicated three times. No crop injury was observed on Liberty-Link cotton in any trial for any Ignite application applied alone. Slight injury was observed with Ignite + Envoke applications at the 8 L stage, but this did not result in yield reductions. Good to excellent weed control was obtained for sicklepod, entireleaf morningglory, hybrid pigweed, coffee senna, common cocklebur, Texas panicum, large crabgrass, and crowfootgrass in these trials. All treatments at all locations yielded greater than the untreated. Optimum seed cotton yields were obtained for all weed control systems at all locations excepting Headland in 2003 where the sequential application of Ignite alone yielded lower than treatments containing Prowl preemergence followed by Ignite. In summary, Liberty-Link cotton provides a valuable tool for weed control to Alabama growers. A total postemergence system is feasible, but the use of a preemergence grass herbicide like Prowl will increase overall grass control.