Compatibility of fenoxaprop-P-ethyl with carfentrazone-ethyl metsulfuron-methyl and 2, 4-D for controlling complex weeds of wheat.

The compatibility of fenoxaprop-P-ethyl with carfentrazone-ethyl for the control of complex weed flora in wheat was evaluated during rabi 2005–06 and 2006–07 at CCS Haryana Agricultural University Regional Research Station, Karnal, India. The treatments included fenopxaprop+carfentrazone 100 and 120 g/ha in 4: 1, 5: 1 and 6: 1 ratio, fenoxaprop+metsulfuron-methyl 100 g/ha in 30: 1 and 40: 1 ratio, fenoxaprop+2, 4-D Ester and Na salt 500 g/ha in 1: 4 ratio, in comparison to fenoxaprop+A (adjuvant) 100 g/ha, fenoxaprop 120 g/ha and carfentrazone 20 g/ha along with weed free and weedy check. The density and dry weight of Phalaris minor decreased with widening of the ratio from 4: 1 to 6: 1 combination of fenoxaprop+carfentrazone at both the doses. In general, fenoxaprop+carfentrazone 120 g/ha was better than 100 g/ha in respect of density and dry weight of P. minor. Fenoxaprop+carfentrazone at 120 g/ha in all the ratios resulted in grain yield at par with weed free check during both the years. Among all the treatments, maximum number of effective tillers and grain yield were recorded with fenoxaprop+carfentrazone 120 g/ha (5: 1) during both the years. Carfentrazone was compatible with fenoxaprop as tank mixture and there was no adverse effect on efficacy of both the herbicides. Fenoxaprop+carfentrazone 120 g/ha (5: 1) appeared to be the best combination for achieving maximum weed control efficacy and improved grain yield. Metsulfuron 2, 4-D Ester and Na salt had antagonistic effect on the efficacy of fenoxaprop when applied as tank mixture with it.