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Field experiments were conducted during Navarai (rabi) seasons of 2011 and 2012 with ADT-36 rice (Oryza sativa L.) variety to evaluate the effect of weed management practices. Pooled data of the two years revealed that application of butachlor @ 1.5 kg a.i/ha followed by weekly cono-weeding from 21 to 42 days after transplanting (DAT) resulted in least weed count, dry-matter production and nutrient removal which resulted in the highest weed control efficiency, productive tillers/hill, grains/panicle, number of filled grains/panicle and enhanced the grain yield, which was 0.73 and 0.46 t/ha more compared to twice hand weeding and conventional method of butachlor application followed by hand weeding.
Moorthy et al. (Tue,) studied this question.