Study on the Safety Application of Fipronil on Rice

The degradation and final residues of fipronil in rice were studied through field experiments and chromatographic analyses. The degradation of fipronil in plant and water of rice field were quicker(the half-lives were 3～4 days). The degradation in soil were slower(the half-lives were 13.8 days). For treatmant of planting after mixing with Fipronil 25% FS at recommended dosage and double dosage,the whole residues of fipronil and metabolic matters in unpolished rice at harvest were less than 0.005 mg/kg.