在湖南长沙进行田间试验,研究10%精噁唑禾草灵.氰氟草酯乳油(商品名:百除)在稻田水、土壤及水稻植株中的消解与残留动态。结果表明:百除中2种有效成分精噁唑禾草灵和氰氟草酯在稻田环境中的消解均符合一级动力学方程。精噁唑禾草灵在稻田水、土壤及水稻植株中的半衰期分别为3.51、1.63和2.14 d,氰氟草酯的半衰期分别为3.18、1.61和2.05 d。在推荐使用剂量下,收获稻谷中精噁唑禾草灵和氰氟草酯的残留量低于美国、韩国或日本残留限量标准,因此本试验条件下收获的稻谷食用是安全的。 A field experiment was conducted in Changsha, Hunan Province to study the digestion and residual dynamics of 10% fenoxaprop-P-cyanamide EC (EC) in Paddy water, soil and rice plants. The results showed that the digestion of two active ingredients, fenoxaprop and cyhalofop, in the paddy field were in accordance with the first-order kinetic equation. The half-lives of fenoxaprop-citrate in paddy water, soil and rice plants were 3.51, 1.63 and 2.14 days respectively, and the half-lives of Cyhalofop-butyl were 3.18, 1.61 and 2.05 days, respectively. At the recommended dosage, the residues of fenoxapr and Cyhalofop-methyl in harvested rice were lower than those of the United States, South Korea or Japan, so rice harvested under the conditions of this test is safe to eat.