一展清可以用于直播稻田前期单双子叶杂草的防除,在稗草2~4叶,用药量在4 500~6 000 m L/hm2之间,药后15 d,对单双子叶杂草的株防效和鲜重防效,都在95%以上;在稗草4~6叶,用药量在4 500~6 000 m L/hm2之间,药后15 d,对单子叶杂草的株防效和鲜重防效均十分理想,但对双子叶草的防效却显著下降。一展清使用后对水稻叶色有稍微落黄现象但不影响生长,对莎草防效差。 A show clear can be used for direct control of monocotyledonous weeds in direct-seeded rice fields, 2 to 4 leaves of barnyard grass, dosage of 4 500 ~ 6 000 m L / hm2, after 15 d, Grass control efficacy and fresh weight control were over 95%; in barnyardgrass 4 to 6 leaves, the dosage of 4 500 ~ 6 000 m L / hm2 between 15 d after treatment, the monocotyledonous weeds The plant control efficacy and fresh weight control are very good, but the control effect of dicotyledon was significantly decreased. A clear after use of rice leaf color slightly yellow phenomenon but does not affect the growth of sedge control effect is poor.