Author(s): H. BANERJEE, M. DAS AND S. P. BHATTACHARYA

Abstract: A field experiment was conducted during the boro season (2000) to study the bioefficacy of some herbicides in transplanted summer rice against the predominant weed species such as Echinochloa crusgalli, Leersia hexandra, Cyperus iria, C. difformis, Fimbristylis miliacea, Monochoria vagina/is, Sagittaria sagittifo/ia, Marsilea quadrifoliata, Ludwigia parviflora and Alternenthera sessilis. The experimental result showed that handweeding twice at 20 and 40 DAT gave the highest grain and straw yields (5.14 and 6.23 ton/ ha respectively), which, however. did not differ significantly with the treatment Almix 20 WP @ 4 g a.i./ ha + Butachlor 50 EC @ 1250 g a.i./ha (tankmixed) applied as pre-emergence at 3 DAT. The herbicide mixtμre showed promising control of all categories of dominant weeds and finally gave higher yields (4.95 ton ha·1 for grain and 6.08 ton ha·1or straw). exhibiting no phytotoxicity symptom to the crop plant.

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