Date of sowing, Direct-seeded rice, Economics, Weed management, Unpuddled

A field experiment was conducted during the Kharif season of 2006 and 2007 at G.B. Pant University of Agriculture and Technology, Pantnagar to find out the most effective weed control method under different sowing dates in direct-seeded unpuddled rice. Highest grain yield (2.5-2.7 t/ha) was recorded from 20 June sowing. The grain yield was the highest in mechanical weedings at 20 and 40 DAS. Pendimethalin 1.0 kg/ha + anilophos 0.4 kg/ha (pre-emergence) produced significantly higher grain yield (3.1-3.3 t/ha) over rest of the herbicidal treatments. Uncontrolled weeds reduced the grain yield of rice by 67-70%.