Author(s): A. P. PATRA AND MITHUN SAHA

Abstract: A field experiment was conducted dw-ing Kharif 2003 and 2004 at the Instructional farm of BCKV, Nadia to evaluate the efficiency of herbicides for controlling weeds in transplanted winter rice under new alluvial zone of West Bengal. The weed flora mainly associated with crop were Cyperus difformis, Fimbristylis miliaceae, Scirpus articulatus, Sphenochlea zeylanica and Ludwigia parviflora. Weed free check produced the highest grain yield (5.17 t/ha), closely followed by manual weeding twice ( 4. 90 tJha) .. Pre-emergence application of Butachlor @ l.O kg a. i./ha at 3 days after transplanting (3 DA1) combined with post-emergence application of Almix@ 0.004 kg a. i./ha at 25 DAT was superior to all other chemical treatments and at par with manual weeding by reducing dry weight and density of weeds at 30 and 60 DAT, resulting the enhancement of yield attributing characters, and finally the higher grain production (4.69 tJha). Butachlor or Almix when applied alone resulted significant reduction in yield and yield components as compared to their combined application.

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