investigating the efficacy of some new herbicides on corn weeds in jiroft region

in order to evaluate the efficacy of some new herbicides in corn farms, a field study was conducted during the 2010 growing season in jiroft. the experimental design was completely randomized blocks, with 11 treatments and 4 replications. treatments were nicosulfuron at 2lit/ha, foramsulfuron at 2.5 lit/ha, rimsulfuron at 50 g/ha, nicosulfuron+ rimsulfuron at 175 g/ha, bromoxynil+mcpa at 1.5 lit/ha + hand weeding of grasses, 2, 4-d+ mcpa + hand weeding of grasses, foramsulfuron + iodosulfuron at 1.25, 1.5, 1.75 l/ha, bromoxynil+mcpa at 1.5 lit/ha + nicosulfuron at 1 lit/ha, and weed free. results indicated that all herbicides showed a significant impact on weed density and dry weight of echinochola colonum, digera muricata, portulaca oleracea, amatanthus viridis, and a. blitoides. these weeds were successfully controlled by foramsulfuron + iodosulfuron at 1.5 and 1.75 l/ha. satisfactory control of these weeds obtained by bromoxynil+mcpa + nicosulfuron and nicosulfuron+ rimsulfuron. but they are poorly controlled by herbicide rimsulfuron. the highest and lowest grain yields belonged to foramsulfuron + iodosulfuron at 1.75 l/ha and rimsulfuron, respectively.