Author(s): P. HALDER, S. MAITI, S. P. BHATTACHARYA AND H. BANERJEE

Abstract: A field experiment was conducted during boro season (2000) to study the comparative efficacy of Pyrazosulfuron Ethyl (PSE) alone and its combination with Molinate against weed complex of boro paddy at the University Teaching Farm, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal. The predominant weed species were Echinoch/oa crusgalli, Cyperus iria,Fimbnstylis miliacea, Scripus maritimus, Monochoria vaginalis, Ludwigia parviflora and Ammania baccifera. The result of the experiment revealed that among all the chemicals tried in this investigation PSE 10% WP @ 16 g a.i. /ha was the best in reducing weed population and weed dry weight without showing any phytotoxic symptoms in rice. Though hand weeding twice at 20 and 40 DAT gave the maximum grain yield, benefit: cost ratio clearly showed that PSE 10% WP@ 15g a.i./ha is the right herbicide to replace the hand weeding treatment.

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