Vol. 13 No. 1
Bioefficacy of pyrazosulfuron and bensulfuron methyl in combination with pretilachlor against weeds in transplanted rice (Oryza sativa l.) under temperate conditions of Kashmir
Author(s): M. ANWAR BHAT, A. HUSSAIN, M. A. GANAI, I. A. JEHANGIR AND N. A. TELI
Abstract: Field experiment entitled “bioefficacy of pyrazosulfuron and bensulfuron methyl in combination with pretilachlor against weeds in transplanted rice under Kashmir conditions” was conducted at Mountain Research Centre for Field Crops, Sher-e- Kashmir University of Agricultural Sciences and Technology of Kashmir during kharif 2014 and 2015. The experiment comprised of six treatments (W1:Pretilachlor+Bensulfuron methyl, W2:Pretilachlor+ pyrazosulfuron, W3:Butachlor, W4:Hand weeding twice (15 and 30 DAT), W5 :Weed free and W6:Weedy check) replicated four times in a randomized block design. The results revealed that application of Pretilachlor+Bensulfuron methyl, on an average caused a reduction of 7.44 and 79 per cent in weed population as compared to butachlor and weedy check, respectively. Pretilachlor+pyrazosulfuron application also proved effective in controlling the weeds and reduced their density by 10.25 per cent compared to commonly used butachlor. Among the tested herbicides, lowest weed dry matter of 9.45 (3.22) g m-2 was recorded with Pretilachlor+pyrazosulfuron application. Application of Pretilachlor+Bensulfuron methyl exhibited a superiority of 11.09 per cent in reducing the dry weight of weeds as compared to Butachlor and the corresponding figure for Pretilachlor+pyrazosulfuron was 17.06 per cent. Combination application of Pretilachlor+pyrazosulfuron recorded considerably higher grain yield (7.27 t ha-1) than butachlor (6.74 t ha-1) and weedy check (4.17 t ha-1). The superiority exhibited by Pretilachlor+pyrazosulfuron over butachlor was 7.35 and 7.76 per cent during 2014 and 2015, respectively.
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