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Weed Management in Conservation Tillage Systems Using Roundup in Roundup Ready Cotton

J.W. Keeling and P.A. Dotray


 
ABSTRACT

Conservation tillage production systems using a wheat or rye cover crop have gained acceptance on the Texas High Plains but effective weed control is often more difficult to achieve than in conventional tillage systems. Field studies were conducted at two locations on the Texas High Plains in 1996 to evaluate weed management in conservation tillage systems with postemergence topical (PT) glyphosate (Roundup Ultra) applications in Roundup Ready® Cotton. At each site, rye was planted as a winter cover crop and terminated 2-3 weeks prior to cotton planting. Roundup Ready cotton (PM 2326RR) was planted on May 21 without tillage. Conservation tillage herbicide systems at each location included 1) glyphosate only; 2) glyphosate and prometryn post-directed (PD) layby; 3) trifluralin incorporated by chemigation (PPI) and prometryn PE and glyphosate; and 4) trifluralin PPI and prometryn PE. Trifluralin PPI and prometryn PE were used in the conventional tillage system. Conservation tillage treatments were cultivated once during the growing season while conventional tillage plants were cultivated three times. Both conventional and conservation tillage treatments not treated with glyphosate were hand-hoed. Plots at Location I were 8 rows by 300 ft with three replications and plots at Location II were 24 rows by 300 ft with 3 replications. Both locations were irrigated as needed throughout the growing season.



Reprinted from Proceedings of the 1997 Beltwide Cotton Conferences pg. 781
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998