Performance of sequential application of carfentrazone and pinoxaden in late sown wheat in eastern UP

Field experiment was conducted during the winter season of 2009–10 at Agronomy Research Farm of ND University of Agriculture and Technology, Kumarganj, Faizabad, UP to study the effect of sequential application of different herbicides on late sown wheat of eastern Uttar Pradesh. Sequential application of pinoxaden 40 g followed by carfentrazone 25 g/ha (NH₂SO₄ 1%) proved significantly effective in reducing density and biomass of weeds and gave complete control of grassy and broadleaf weeds without any phototoxic effect on crop as compared to carfentrazone at 35 days after sowing. The maximum grain yield 43.02 q/ha was recorded with completely weed free situation and it was statistically comparable with yield (41.6 q/ha) obtained under sequential application of pinoxaden 40 g followed by carfentrazone 25 g/ha (NH₂SO₄ 1%) while lowest yield 31.4 q/ha in weedy condition and its vice versa without surfactant (NH₂SO₄ 1%). Increase in grain yield due to treatments effect over weed free ranged from 23.8 to 37.0 per cent. B:C ratio also followed same path as in case of grain yield.