Efficacy of some herbicides for ecosafety and economic weed management in transplanted Kharif Rice

D Pal, M Pramanick, D Mandal, B Patra, M Sardar
2007 Journal of Crop and Weed   unpublished
Field experiment was conducted in a randomized block design with three replications at Instructional Farm of New Alluvial Zone, BCKV at Jaguli, Nadia, West Bengal during kharif seasons of 2003-2004 on sandy clay loam soil having pH 7.01 with the objectives to study the efficacy of some herbicides in transplanted kharif rice vis-à-vis to develop a safe farmer's acceptable economic method of chemical weed control. The experimental results revealed that among the ten treatments, Hand weeding twice
more » ... Hand weeding twice at 25 and 45 DAT (Days after transplanting) gave the highest grain yield (4.50 t ha-1), which, however did not differ significantly with the treatment Fentrazamide 50 WP @ 150 g.a.i. ha-1 applied as pre-emergence at 7 DAT. This herbicide @ 150 g.a.i. ha-1 offered promising control of all categories of dominant weeds and finally gave second highest grain yield (4.39 t ha-1), exhibiting no phytotoxicity symptom to the crop plant. Regarding benefit : cost ratio, highest value (1.03) was obtained with the use of Fentrazamide 50WP @ 150 g.a.i. ha-1 which was closely followed by Fentrazamide 50 WP @ 120 g.a.i. ha-1 (0.94). So tedious, time consuming and costly hand weeding method can profitably be replaced by the application of Fentrazamide 50 WP @ 150 g.a.i. ha-1 as pre-emergence at 4-7 DAT, which has been found to be the most cost saving and also a safe weed control treatment.