Quinclorac: Quinclorac is selective herbicide in controlling the Echinochloa crus-gall. Especially effect to the Echinochloa crus-gall when it has foliage from three to seven, It is also effectively used to control the Monochoria vaginalis, Oenathejatanica etc. Quinclorac can be degenerated by the roots of the rice and decomposed by soil microorganism. So it is safety to the rice when spraying in the field rice.