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; a...