Modification to degradation of hexazinone in forest soils amended with sewage sludge

► Effect of sewage sludge on hexazinone behavior is reported in forest soil. ► Degradation of hexazinone starts in soil A and C without lag period. ► Biological mechanism accounts for 51.8-62.4% of degradation in soils. ► Two metabolites are found in sewage sludge-amended soil B.