【摘要】 为明确三唑磺草酮对直播稻田一年生禾本科杂草的防效、安全性及对常见后茬作物的影响，开展相关田间试验进行了研究。结果表明，6%三唑磺草酮可分散油悬浮剂对直播稻田稗草和千金子具有良好的效果。施药后40 d,103～135 g a.i./hm~2处理的总体株防效和鲜重防效分别达85.68%～94.69%和91.07%～96.95%，其中135 g a.i./hm~2处理的防效显著高于100 g/L氰氟草酯乳油105 g a.i./hm~2处理。6%三唑磺草酮可分散油悬浮剂在103～238 g a.i./hm~2剂量下对籼稻品种19香安全，与空白对照相比增产率达433%以上。在6%三唑磺草酮可分散油悬浮剂103.5～310.5 g a.i./hm~2剂量下，后茬作物菜心、花生和甜玉米的出苗率、株高、地上部生物量和产量均与空白对照无显著性差异。研究认为，6%三唑磺草酮可分散油悬浮剂可安全用于防除直播稻田常见一年生禾本科杂草，对后茬作物具有良好的安全性。更多还原

【Abstract】 Field experiments were conducted to determine the control efficacy of tripyrasulfone against annual grass weeds and safety in direct-seeded rice field, and the influences on common succeeding crops were evaluated. The results showed that, tripyrasulfone 6% OD displayed good control effects on Echinochloa crusgalli and Leptochloa chinensis in direct-seeded rice field. After 40 days treatment of tripyrasulfone 6% OD 103-135 g a.i./ha, the total control effects on plant number and fresh weight were 85.68%-94.69% and 91.07%-96.95%, respectively, and the control effect of the treatment(tripyrasulfone 6% OD 135 g a.i./ha) was significantly higher than the treatment of cyhalofop-butyl 100 g/L EC(105 g a.i./ha). Tripyrasulfone 6% OD was safe to indica type rice Xiang 19 under the dosage of 103-238 g a.i./ha, and the yield increase rate was over 433% compared with blank control. Under the dosage of tripyrasulfone 6% OD 103.5-310.5 g a.i./ha,the emergence rates, plant heights, above-ground biomasses and yields of three succeeding crops, Chinese flowering cabbage, peanut and sweet corn, were not significantly different from those of blank control, suggesting that tripyrasulfone6% OD should be safely used to control common annual grass weeds in direct-seeded rice field, and has good safety for succeeding crops.更多还原