EFFICIENCY OF ISOPROTURON FOR WEED-CONTROL IN INDIAN MUSTARD (BRASSICA-JUNCEA)

A field experiment was conducted at Morena during 1991 and 1992 to stu dy weed control in Indian mustard [Brassica juncea (L.) Czernj. & Coss on] with isoproturon applied at variable doses during preplanting, pre -emergence and post-emergence. Isoproturon at 1.0 kg/ha applied as pre -plant and preemergence caused significant reduction in weed dry weigh t, showing 83 and 81% weed-control efficiency respectively. This treat ment also gave significantly higher grain yield, 1,000;grain weight an d branches/plant than unweeded control and herbicide at lower doses ap plied at either of the stage. Unchecked weed growth lowered seed yield by 34%.