Abstract

                                A field experiment was conducted at research farm, Department of Agronomy, Institute of Agricultural Science, Banaras Hindu University, Varanasi to test various herbicides either alone or in mixture at different rates of application. The herbicides were metsulfuron-methyl + carfentrazone-ethyl at 17.5, 22.5, 25.0, 30.0 and 50.0 g a.i. ha -1 applied with and without 0.2% non-ionic surfactant, metsulfuron-methyl at 4 g a.i ha -1 , carfentrazone-ethyl 20g a.i. ha -1 and 2,4-D sodium salt at 750 g a.i. ha -1 . Chenopodium album, Melilotus spp. (indica+alba), Anagallis arvensis and Rumex denatus were main weeds. Metsulfuron-methyl + carfentrazone-ethyl (50 g/ha + 0.2% surfactant) followed by metsulfuron-methyl + carfentrazone-ethyl at 25 and 30 g/ ha + surfactant were most effective against all the broad leaf weeds. Plant height, number of tillers m -1 row and dry weight m-1 row were maximum in metsulfuron-methyl + carfentrazone- ethyl (50 g/ha + 0.2% surfactant). It was followed by metsulfuron-methyl + carfentrazone-ethyl at 25 and 30 g/ha + 0.2% surfactant. The maximum improvement in yield attributes and yield of crop was recorded with metsulfuron-methyl + carfentrazone-ethyl (50 g/ha + 0.2% surfactant) was followed by metsulfuron-methyl + carfentrazone-ethyl at 25 and 30 g/ha + 0.2% surfactant.

Key words : Herbicides, surfactant, untreated control, wheat, yield attributes.