Abstract

Field experiments were conducted on the clay loam soils of Annamalai University Experimental Farm in 1994 and 1995 during January to April. The treatments included three herbicides viz., metribuzin (0.5 and 1 kg ha), fluchloralin (1 kg ha) and pendimethalin (1 kg ha'') tested individually and in combination with one hand weeding (HW) at 45 days after sowing (DAS) in comparison with two HW and an unweeded control. Among the herbicides, metribuzini at 1 kg ha +HW recorded least weed population and dry matter production at 60 DAS. The above treatment resulted in higher yields compared to other herbicides and their integration with one Hw. However, it was comparable with two HW. In general. herbicides integrated with one HW gave more yield than herbicides alone.

Keywords: Herbicides, metribuzin. fluchloralin, pendimethalin, weeds, soybean yield.