Effect on 50% Quinclorac WP on Controlling Barnyard-grass in Rice Field

The effect of 50% quinclorac WP on controlling high leaf-age barnyard grass in rice seedling was eminent,the cure rate was high and it was safe for rice growth.By spraying stems and leaves with 0.75 kg/hm2 50% quinclorac WP in seedling stage,the controlling rate against 3~5 high leaf-age barnyard grass was up to 98%,and the rice seeding wasn′t hurt.