Efficacy of Penoxsulam Against Weeds in Transplanted Kharif Rice (Oryza sativa L.)

A field experiment was carried out during kharif seasons of 2006 and 2007 to study the comparative efficacy of penoxsulam against weeds in transplanted kharif rice at the Regional Research Sub-Station, Chakdaha under Bidhan Chandra Krishi Viswavidyalaya. The experiment was laid out in a randomized block design with seven treatments replicated thrice. Echinochloa colona, Cyperus difformis, Monochoria vaginalis and Ludwigia parviflora were the major weeds associated with transplanted kharif rice. Penoxsulam at 22.5 g/ha applied at 8–12 days after transplanting (DAT) was most effective to check all weed species and their growth and yielded maximum grain (3.53 t/ha) and straw yield (4.73 t/ha) of rice resulting in lowest weed index (5.61%). Therefore, penoxsulam at 22.5 g a. i./ha applied at 8–12 DAT may be recommended to replace the tedious, time consuming and expensive hand weeding practice of weed control in transplanted kharif rice.