双氟磺草胺在小麦和土壤中的残留动态及安全性评价

摘要

为探明双氟磺草胺在小麦上的残留特性和使用安全性，通过田间试验和室内检测，研究了双氟磺草胺在小麦及土壤中的残留动态及最终残留量。结果表明：双氟磺草胺在小麦植株中的半衰期分别为2．0～5．8 d，药后14 d 消解82％以上。双氟磺草胺在土壤中的半衰期为5．5～9．6 d，药后21 d 消解80％以上。10％双氟磺草胺可湿性粉剂4．5、6．75 g a．i．／hm2，施药1次，收获期采收的小麦籽粒中双氟磺草胺残留量均低于0．01 mg／kg（MRL）。10％双氟磺草胺可湿性粉剂按推荐剂量和方法使用，收获期采收的小麦是安全的。%To determine the residue characteristics and safety,the residual degradation dynamics and final residues of florasulam in wheat and soil were studied by field experiment and laboratory test.The results showed that the half -life of florasulam in wheat plant and soil were 2.0 ~5.8 d and 5.5 ~9.6 d respective-ly,esidue degradation rate in wheat plant at 14 d after application was above 82%,and it was above 80% in soil at 21 d after application.When the wheat field was sprayed 1 time with 4.5 g a.i./hm2 and 6.75 g a.i./hm2 florasulam 10%WP,the florasulam residue in the harvested wheat grain was lower than 0.01 mg/kg(MRL).It was suggested that florasulam was safe to apply in wheat according to the reference dose and methods.