Effect of herbicidal weed management in direct-seeded rice (Oryza sativa) and its residual effect on succeeding lentil (Lens culinaris)

A field experiment was conducted during wet and dry seasons of 1995-97 to s tudy the effect of herbicidal weed-management practices in controlling weed s in rice (Oryza sativa L.) and its residual effect on the succeeding lenti l (Lens culinaris Medikus) in rainfed lowlands. Pre-emergence mixture of an ilofos+2,4-DEE (0.3+0.5 kg a.i./ha) followed by 1 hand-weeding at 40 days a fter sowing in rice recorded the lower population and dry weight of weeds s ignificantly compared with butachlor and pendimethalin in both crops. Weedy check till maturity in rice reduced the grain yield of rice by 50.1% compa red to weed-free till maturity. The yield of succeeding lentil was the high est in the plots of rice which received anilofos + 2,4-DEE as pre-emergence and 1 hand-weeding at 40 days after sowing. This treatment also gave the h igher benefit: cost ratio (2.50).