In conclusion, degradation of flumioxazin in soil under aerobic condition occurs by oxidation and dealkylation of the propynyl group to form 482-CA and IMOXA which can be hydrolysed to THPA in equilibrium with delta-TPA. A second pathway involves hydrolysis of flumioxazin to 482-HA which can be hydrolysed to APF and to THPA in equilibrium with delta-TPA. No metabolite is found in significant amount. The THP moiety is highly mineralised (up to 55 %) and forms low amounts of bound residue (< 30 %). The phenyl moiety is moderately mineralised (up to 14 %) and forms large amounts of bound residue (up to 74 %). Extraction of bound residue with acetonitrile - hydrochloric acid releases several unidentified radioactive compounds and about half of the bound radioactivity is associated to humic substances.