Bioefficacy of quinchlorac herbicide against weeds in transplanted rice

The Field experiment was conducted during Kharif season 2015 at Research Cum Instructional farm of Indira Gandhi Krishi Vishwavidyalaya, Raipur C.G. to evaluate the quinchlorac herbicide against weeds in transplanted rice. Ten weed control treatments were laid out in randomized block design with three replications. The result revealed that the major weed species in experimental site were Cyperus iria L, Cyanotis axillaris L, Alternanthera triandra L, Echinochloa colona L, Ischaemum rugosum Salisbury, and Caesulia axillaris Roxb. Among the herbicides, minimum weed density (5.53) and dry matter of weeds/m2 (5.18) were found under quinchlorac 250g/l SC + bispyribac sodium (10% SC) @ 250 + 20 g ha-1. Hand weeding twice at 60 and 80 DAT, gave highest weed control efficiency (86.02%) Whereas, quinchlorac 250g/l SC + bispyribac sodium (10% SC) @ 250 + 20 g ha-1 gave 74.93 and 80.40% weed control efficiency at 20 DAT and at harvest respectively. The highest grain yield (5.37 t ha-1), straw yield (6.61 t ha-1) and harvest index (44.81%) was recorded under quinchlorac 250g/l SC + bispyribac sodium (10% SC) @ 250 + 20 g ha-1.