comparison of different chemical herbicides to control of broad leaf weeds of common bean in yasouj, kohgiloyeh and boyerahmad province

in order to investigate the effect of chemical herbicides on control of broad leaf weeds of common bean, an experiment was conducted in 2007 at yasouj with 12 treatments in a randomized complete block design with 3 replications. treatments consisted of preplant application of trifluralin herbicide at 960 g ai ha-1; postemergence application of bentazon at 1200 g ai ha-1; imaztapir at 50, 75 and 100 g ai ha-1; fomesafen herbicide at 426, 639 and 852 g ai ha-1; storm herbicide at 426, 639 and 1065 g ai ha-1; control weed free treatment by hand weeding and non-treated control were maintained weed free during the growing season. results showed that the most effective treatment for increasing yield was trifluralin which was similar to control and then followed by bentazon and fomesafen herbicides in all 3 doses. maximum and minimum reduction of shoot dry weight of weeds was observed with trifluralin and bentazon application. generally, concerning the problems of trifluralin application that may affect next crop, post emergence application of fomesafen is recommended. this herbicide, in addition to low impact on crop, has high potential for weed control.