Studies on bio-efficacy of some new generation herbicides on summer rice

Bhattacharya, S.P.; Poddar, P.; Islam, M.A. . Dept. of Agronomy

Studies on bio-efficacy of some new generation herbicides on summer rice

2000

Bhattacharya, S.P. | Poddar, P. | Islam, M.A. (Bidhan Chandra Krishi Viswavidyalaya, Mohanpur (India). Dept. of Agronomy)

An experiment on rice (Oryza sativa L.) was conducted in clay-loam soil during the boro season (1995-'96) to study the bio-efficacy of some new generation herbucudes on summer rice at University Teaching Farm, Mondauri, B.C.K.V., Nadia, West Bengal, having ten treatments with three replications fitted in a Randomised Block Design. This results of the experiment revealed that the lowest weed population (at 60 DAT) of 19.33/m2 and lowest weed dry weight (at 60 DAT) of 10.70 g/m2 was exhibited by T9 (hand weeding twice at 20 and 40 daus after transplanting) being statistically at par with T7 (Anilophos 18 EC + 2, 4-D Na salt 80% a.i. @ (375+350) g a.i./ha) showing 25.00/m2 weed population (at 60 DAT) and 13.86 g/m2 weed dry weight (at 60 DAT). But highest grain yield (50.74 q/ha) was obtained with T7. That is why anilophos 18 EC + 2, 4-D Na salt 80% a.i. @ (375=350) g a.i./ha showed the best performance in relation to weed control and weed dry weight resulting maximum grain yield which, however, was found statistically at par with the treatment hand weeding twice at 20 and 40 DAT (grain yield - 50.48 q/ha) and Butachlor 50 EC @ 1.5 kg a.i./ha (grain-yield 48.92 q/ha) and Butachlor 50 EC @ 1.5 kg a.i./ha (grain-yield 48.92 q/ha). Unweeded control (T10) performed the worst.

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