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[目的]明确5%丙草胺·硝磺草酮颗粒剂(GR)对水稻移栽田杂草的防除效果及对水稻的安全性。[方法]采用水稻移栽后5~7 d均匀撒施,定期定点调查的方法进行田间药效试验。[结果]5%丙草胺·硝磺草酮颗粒剂对水稻生长安全,可有效防除一年生禾本科、阔叶及莎草科杂草,施药后30 d,总株防效及总鲜质量防效均大于95%。[结论]5%丙草胺·硝磺草酮GR可有效防除水稻移栽田杂草并对水稻具有较好的安全性,适宜用量为有效成分750~825 g a.i./hm2。
[Objective] The research aimed to clarify the control effect of 5% pretilachlor mesotrione granules (GR) on weeds in transplanted rice fields and its safety to rice. [Method] The experiment of field efficacy was carried out on the 5 ~ 7 days after transplanting of rice by means of regular spot investigation. [Result] 5% pretilachlor mesotrione granules were safe to rice growth and could effectively control annual grasses, broadleaf and sedge weeds. After 30 days of application, the control efficacy and total fresh weight Control effect is greater than 95%. [Conclusion] 5% propylchlor and mesotrione GR can effectively control weeds in the transplanted rice fields and has good safety to rice. The suitable dosage is 750-825 g a.i./hm2.