Oxaziclomefone is a new kind of systemic and conductive herbicide with a matrix of phenoxazone. It could show outstanding herbicidal characteristics, such as less application amount, long period for suitable application, and long persistent period against weeds. The experimental results indicated that the annual grassy weeds in direct seeding fields of rice,such as semen euphorbiae Leptochloa chinesis and cockspur grass Echinochloa crusgalli, as well as sedges, could be controlled effectively by 30％ oxaziclomefone SC. After 45 days treatment with 30％ oxaziclomefone SC at the preparation concentration of 75.0～150.0 mL/hm2, the stem control effects and the fresh weight control effects against grassy weeds were more than 85％, against sedges were 75％～85％, but the control efficiency against broad-leaved weeds was poor. These results suggested that 30％ oxaziclomefone SC was applicable as a new candidate herbicide for annual grassy seeds management, such as E. crusgalli and L. chinesis, in direct seeding fields of paddy rice in South China.%噁嗪草酮是一种具有噁嗪酮母体的新型内吸传导型除草剂,具有使用量低、适宜施药期长、持效期长等特点.田间试验结果证明,30%噁嗪草酮悬浮剂(SC)可有效防除水稻直播田千金子、稗草等一年生禾本科杂草,对莎草具有较好的兼防作甩,以制剂用量75.0～150.0mL/hm2喷施后45 d内对禾本科杂草株防效和鲜重防效均可达85%以上,对莎草的防效可达75%～85%,但对阔叶类杂草的防效较差.30%噁嗪草酮SC可供选用防除南方水稻直播田千金子、稗草等一年生禾本科杂草.
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