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B/RR-Cotton Performance in Roundup and Conventional Weed Management Systems

M.P. Harrison, N.W. Buehring and R.R Dobbs


ABSTRACT

A study was conducted during 2000 and 2001 to evaluate yield and weed control for bollworm/Roundup (glyphosate) tolerant (B/RR) cotton varieties (Paymaster 1218 BG/RR, Stoneville 4892 BR, Sure-Grow 501 B/RR and Deltapine 451 B/RR) response in conventional and Roundup weed management systems. Conventional varieties (Stoneville 474, Sure- Grow 747, Phytogen PSC 355, and Sure-Grow 501) were also included in the conventional weed management system. The experimental design was a randomized complete block with four replications. The study was conducted on a Leeper silty clay loam soil where weed infestations of pitted morningglory (Ipomoea lacunosa) and pigweed (Amaranthus sp.) were light to moderate. Both weed management systems achieved high levels of weed control (>95% late season control). Regardless of year, B/RR varieties showed no differences in percent lint turnout or yield due to weed management system. Lint yields for B/RR varieties, across weed management systems, ranged from 1184 to 1423 lb/ac in 2000 and 879 to 1072 lb/ac in 2001. Yields for B/RR cotton varieties were equal or greater than the conventional varieties. Lint yield for the conventional varieties ranged from 1182 to 1526 lb/ac in 2000, and 887 to 952 lb/ac in 2001. Lint percent turnout ranged from 39 to 44% in 2000 and 34 to 38% in 2001. Both years lint percent turnout for B/RR varieties were not affected by weed management systems. Deltapine 451 B/R had the lowest percent lint turnout of 39% in 2000 and 34% in 2001. Sure-Grow 501, Stoneville 4892 BR and Stoneville 474 had the highest lint percent turnout of 44% in 2000 and 37 to 38% in 2001.





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Document last modified May 20, 2002