Abstract
A field experiment was conducted during the rainy seasons of 2000 and 2001 on transplanted rice (Oryza sa- tiva L.) at Chiplima, Orissa, to evaluate the efficiency of different herbicides and herbicide mixtures. Application of almix 0.004 kg tank-mixed with butachlor (1.0 kglha) 3 days after transplanting (4.80 t grainslha) or application of butachlor (1.0 kg) at 3 days after transplanting (DAT) followed by sequential application of almix 0.004 kglha at 25 DAT (4.69 t grainslha) was as good as hand-weeding twice at 20 and 40 DAT (4.84 t grainslha) in controlling weeds and achieving grain yield. Application of almix 0.004 kg + butachlor 1.0 kglha and butachlor 1.0 kg, followed by almix 0.004 kglha increased the grain yield by 36.8 and 33.6%, respectively, over the unweeded check. There was a negative linear relationship between weed dry weight and grain yield (r=-0.74).
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