Response of Bt. cotton to post emergence herbicides in Vertisols of Krishna zone.
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Date
2011-01
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Abstract
Cotton, a long duration crop coupled with heavy rains during the early vegetative
stage inhibit manual and mechanical methods of weed control causing heavy yield loss . A field
experiment was conducted to evaluate the efficacy of different post emergence herbicides applied
at 45 DAS viz; glufosinate ammonium 15% SL @ 300 g a.i ha-1, glufosinate ammonium 15% SL
@ 375 g a.i ha-1, glufosinate ammonium 15% SL @ 450 g a.i ha-1, paraquat 24 SL @ 300 g a.i
ha-1, glyphosate 4l SL @1025 g a.i ha-1 on productivity of Bt. cotton entry NCS 145 BG II
against Cyprus rotundus, Commalina bengalensis, Corchorus acutangulus, Amaranthus viridis,
Abutilon indicum, Phyllanthus niruri ,Celosia argentia, Parthenium sp etc from 2008 to 2010 in
vertisols under rainfed conditions at Regional Agricultural Research Station, Lam, Guntur. The
seed cotton yield increased significantly due to all the treatments to the magnitude of 66-75% as
compared to weedy check. The highest seed cotton yield of 3094 kg ha-1 was recorded with
glufosinate ammonium 15% SL @ 375g a.i ha-1 followed by hand weeding at 20, 40 and
60DAS (3062 kg ha-1) and glyphosate 41 SL @ 1025 g a.i ha-1 (2902 kg ha-1). The weed density
and weed dry matter recorded were lowest with the application glufosinate ammonium 15% SL
@ 375g a.i ha-1 and glufosinate ammonium 15% SL @ 450g a.i ha-1 when compared to other
treatments.
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Keywords
cotton, weed, post emergence, glufosinate ammonium
Citation
Bharathi S, Pavani M, Narayana E. Response of Bt. cotton to post emergence herbicides in Vertisols of Krishna zone. International Journal of Applied Biology and Pharmaceutical Technology. 2011 Jan-Mar; 2(1): 504-510.