From the studies on the route of degradation in soil it can be concluded that tebuconazole is slowly but steadily degraded in soil under aerobic conditions to the final degradation product carbon dioxide. Parallel to mineralisation, bound residues are formed. A total of seven metabolites were identified in the soil extracts along with the parent compound and carbon dioxide. The majority of the metabolites were found only in trace amounts which shows that they occur as short-lived intermediates and that their further transformation is generally faster than their formation from the parent compound. The highest concentrations were found for 1,2,4-triazole (M26) with a maximum of 9 % of the applied test substance under the described conditions, and for HWG-1608-5-enol (M08) with a maximum of 5 %. The chemical nature of the latter metabolite is not absolutely certain. From the spectroscopic evidence it could also have been the corresponding tautomer HWG -608-5-keto (M09). The degradation under anaerobic conditions shows that no additional metabolites in relation to those occurring already under aerobic conditons are formed.