TITLE:
Evaluation of Weed Control Efficacy and Seed Cotton Yield in Glyphosate Tolerant Transgenic Cotton
AUTHORS:
Nithya Chinnusamy, Chinnusamy Chinnagounder, Prabhakaran Nachimuthu Krishnan
KEYWORDS:
Herbicide Tolerant Cotton; Weed Control Efficiency; Seed Cotton Yield
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.6,
June
4,
2013
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.