Abstract
Field experiment was conducted during kharif 2009 and rabi 2009-2010 at Tamil Nadu Agricultural University, Coimbatore to evaluate the weed control efficiency and yield potential of glyphosate resistant transgenic maize. Treatments consisted of two transgenic maize hybrids named Hishell and 900 M gold with application of glyphosate as post emergence at 900, 1800 and 3600 g a.e/hathese were compared with non-transgenic counterpart maize hybrids with application of atrazine as pre-emergence at 0.5 kg/ha followed by one hand weeding at 40 Days After Sowing along with need based insect control practices. Post emergence application of glyphosate at 900, 1800 and 3600 g a.e/ha in transgenic maize hybrids was recorded with lower weed density and higher weed control efficiency compared to other treatments. Higher grain yield was recorded with post emergence application of glyphosate at 1800 g a.e/ha in transgenic hybrid 900 M Gold and 3600 g a.e/ha in transgenic hybrid Hishell during kharif 2009 and rabi 2009-2010 seasons, respectively.
Highlights
Weed infestation in maize is one of the key factors responsible for the lower productivity and poor quality of produce
Treatments consisted of two transgenic maize hybrids named Hishell and 900 M gold with application of glyphosate as post emergence at 900, 1800 and 3600 g a.e/hathese were compared with non-transgenic counterpart maize hybrids with application of atrazine as pre-emergence at 0.5 kg/ha followed by one hand weeding at 40 Days After Sowing along with need based insect control practices
Post emergence application of glyphosate at 900, 1800 and 3600 g a.e/ha in transgenic maize hybrids was recorded with lower weed density and higher weed control efficiency compared to other treatments
Summary
Weed infestation in maize is one of the key factors responsible for the lower productivity and poor quality of produce. The traditional method of manual and mechanical weeding is quite effective, but arduous, time consuming and highly costly Under such situation, chemical weed control is a better option to conventional methods and use of herbicides forms an integral part of the modern crop production. Herbicide tolerant crops and their weed management systems allowed the use of broadspectrum post emergence herbicides, which have reduced environmental impact. The plants become tolerant to the herbicide while weed flora are suppressed after application of herbicide These efficacious systems allow post emergence use of glyphosate for total weed management in glyphosate tolerant transgenic maize. In view of the importance of chemical weed control in herbicide tolerant transgenic maize, field experiments were conducted at Tamil Nadu Agricultural University, Coimbatore to evaluate the weed control efficiency and yield of transgenic stacked maize hybrids
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