Residual effects of soybean herbicides on the succeeding winter crops

The residual effects of pendimethalin, quizalofop, imazethapyr and imazamox, applied to soybean crop, on the succeeding winter season crops, viz. wheat, barley, spinach, pea, raya, canola and sugarbeet were determined through field bioassay at Ludhiana in 2013–14. Soybean was supplied with fifteen weed control treatments, viz. pendimethalin at 450 g/ha as pre-emergence alone and followed by (fb) hoeing, imazethapyr + imazamox at 60 and 70 g/ha each at 3 and 4 weeks after sowing (WAS), quizalofop 37.5 and 50.0 g/ha at 3 WAS, pendimethalin 450 g/ha fb imazethapyr + imazamox 60 and 70 g/ha at 4 WAS/quizalofop at 37.5 and 50.0 g/ha at 4 WAS, imazethapyr + imazamox 60 and 70 g/ha at 3 WAS fb quizalofop 37.5 g/ha at 6 WAS and unsprayed check. The emergence, plant height and dry matter accumulation of all the succeeding crops were similar among herbicidal and unsprayed plots indicating that all the herbicides are safe for raising of these winter crops in rotation with soybean.