Author(s): M. CHETTRI, PINTOO BANDHOPADHYAY AND S. K. MUKHOPADHYAY

Abstract: A field experiment on chemical control of weeds in cv. Kufri Jyoti was conducted at Block Seed Farm, Hooghly, West Bengal during winter season of 2000-0 l and 2001-02. Six herbicides (Prometryn 50 WP@ Ikg a.i. ha·1, Pedimethalin 30 EC@ 750 gha·1 , Clomazonc 15 EC@ 750 gha·1 , premix fonnulations ofPendimethalin + Clomazone (30 + 15) EC @ 450 + 225 gha·1 , Pendimethalin 30 EC@0.750 Iha·• and Alachlor 50 EC@ 1.0 lha·1 ) were tested against weed free treatment (two hand weedings at 15 and 45 days after planting in conjunction with earthing up at 30 days after planting) and weedy check. Monocot weeds accounted for 77.87 % of the total weed population across all treatments. In the weedy check, monocots accounted for 79.18 % of the total. The density ofmonocot weeds was lowest (40.33 m· 2) in the plots receiving treatments of two hand weedings +earthing up followed by Pendimethalin + Clomazone (30 + 15) EC @ 450 + 225 gha-1(83.80 m·2 ). The effect of Prometryn, Pendimethalin(both granule and liquid formulations) Colmazone and Alachlor was at par. Two hand weedings with one earthing up (weed free treatment) was found to be the best in controlling dicot weeds (28.30 m·2). The same treatment recorded lowest dry matter ofmonocot and dicot weeds ( 10.00 and 7.20 m·2 ) followed by Pendimethalin + Clomazone application and gave the highest tuber yield of 310.93 q ha·1• The highest weed control efficiency of 77.75 % was observed by combined operations of hand weddings and earthing up followed by Pendimethalin + Clomazone (58.09 %) treatments. Minimum weed index of 10.33 % was recorded under premix formul ation of Pendimethalin + Clomazone (30 + 15 EC) @ 450 + 225 gha·1•

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