Abstract
Cotton is one of the important crops that have been genetically altered to address challenges with weed and insect control. The research was conducted with glyphosate resistant cotton hybrids during winter irrigated season of 2009-10 and 2010-11 at the experimental site of Tamil Nadu Agricultural University, Coimbatore, with the objective, to find out the weed control efficacy and yield of transgenic cotton hybrid with the application of glyphosate. Glyphosate was applied as post-emergence application on 25 and 65 DAS at 900, 1350, 1800, 2700, 3600 and 5400 g a.e./ha in MRC 7347 BG-II RRF test hybrid. These treatments were compared with hand weeding on 15 and 30 DAS and unweeded control. In both sprays, post-emergence application of glyphosate 2700, 3600 and 5400 g a.e./ha registered lower weed density and higher weed control efficiency in transgenic cotton hybrid compared with other treatments. Seed cotton yield (3195 and 3092 kg·ha-1 during 2009-10 and 2010-11 respectively) was significantly higher in post-emergence application of glyphosate at 2700 g a.e./ha. Increased use of transgenic cotton with herbicide and pest resistance has resulted in more efficient insect and weed management practices.
Highlights
Cotton hybrids are cultivated under wider plant spacing and heavily fertilized, which in turn invite multiple weed species infestation
The research was conducted with glyphosate resistant cotton hybrids during winter irrigated season of 2009-10 and 2010-11 at the experimental site of Tamil Nadu Agricultural University, Coimbatore, with the objective, to find out the weed control efficacy and yield of transgenic cotton hybrid with the application of glyphosate
Post-emergence application of glyphosate 2700, 3600 and 5400 g a.e./ha registered lower weed density and higher weed control efficiency in transgenic cotton hybrid compared with other treatments
Summary
Cotton hybrids are cultivated under wider plant spacing and heavily fertilized, which in turn invite multiple weed species infestation. The available post-emergence herbicides are mostly non-selective and even directed spray of some herbicides cause considerable crop damage This necessitates the development and testing of selective early post emergence herbicides for weed control in cotton. Cotton hybrid which is resistant to both bollworms and glyphosate would be an added advantage to the cotton growers This new technology is likely to reduce the cost of production and insecticide application by providing an effective alternative to chemical insecticides for control of Helicoverpa armigera [2]. Evaluation of weed control efficiency and yield of glyphosate resistant cotton hybrids has been taken up during winter season (August sowing) of 2009 and 2010 with the objectives of, to assess the effect of glyphosate on the weed control efficacy in winter irrigated herbicide tolerant cotton hybrid and to find out the influence of glyphosate on seed cotton yield of herbicide tolerant cotton
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