Evaluation of Low Dose Herbicides in Transplanted Rice (Oryza Sativa L.).
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Date
2014-10
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Abstract
A field experiment was conducted during kharif 2011 at College of Agriculture, Rajendranagar. The
experiment consisted of 12 treatments laid out in randomized block design with three replications consisting of two
pre-emergence herbicides integrated with post emergence herbicides and one hand weeding at 40DAT and two post
emergence herbicide, hand weeding twice at 20 and 40 days after transplanting, compared with weed free and
unweeded check. The predominant weed flora observed in the experimental field were Echinochloa crusgalli,
Panicum repens, Cynodon dactylon, Cyperus rotundus, Cyperus difformis, Eclipta alba and Ammania baccifera. The
results revealed that pre-emergence application of Bensulfuron methyl 0.6% + Pretilachlor 6% @ 10 kg granules ha-
1+ Hand weeding at 40 DAT (5455 kg ha-1 and 6345 kg ha-1) and Bensulfuron-methyl 0.6% + Pretilachlor 6% @ 10
kg granules ha-1 + Bispyribac sodium @ 25 g a.i ha-1 recorded significantly higher grain and straw yield (5365 and
6265kg ha-1, respectively) which remained at par with two hand weedings at 20 and 40 DAT (5580 and 6464 kg ha-
1). In terms of economics, highest net returns (Rs. 33,189 ha-1) and B:C ratio (1.40) were also high with the preemergence
application of Bensulfuron-methyl 0.6%+ Pretilachlor 6% @ 10 kg granules ha-1+ Bispyribac sodium @
25 g a.i. ha-1 at 20DAT (1.40) compared to that of two hand weedingds (Rs. 31,952 ha-1) and benefit cost ratio (1.17) .
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Keywords
Weed Density, Weed control Efficiency, Weed Index, Grain Yield, Straw yield, Benefit: Cost Ratio
Citation
Uma G, Ramana M Venkata, Reddy A Pratap Kumar, Prakash T Ram. Evaluation of Low Dose Herbicides in Transplanted Rice (Oryza Sativa L.). International Journal of Applied Biology and Pharmaceutical Technology. 2014 Oct-Dec; 5(4): 96-101.