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.