Evaluation of Clethodim Herbicide Efficiency in Comparison to other Graminicides for Weedy Grasses Control in Soybean (Glycin max L.)

Field studies were conducted at Lorestan، Kermanshah and Golestan provinces in 2006 to separately evaluation of Clethodim herbicide for weedy grass control in soybean. All experiments were designed as randomized complete blocks with four replicates. Treatments included: clethodim at 0. 6، 0. 8، 1، and 1. 2 L/ha; cycloxydim at 3 L/ha; Haloxyfop-R-methyl at 0. 75 L/ha; Quizalofop-P-ethyl at 2 L/ha; and weeding control. In Lorestan postemergence application of clethodim at 1. 2 L/ha reduced grass weed biomass by 74%. In Kermanshah، postemergence application of clethodim at 1. 2 L/ha reduced grass weed density by 78%. In Golestan، post emergence application of clethodim at 1، and 1. 2 L/ha reduced barnyarad grass density 75% and 80% respectively. Accordingly، use of clethodim for grass weed control in soybean، because of high-performance and lower consumption in comparison with some common herbicides is recommended.