Effects on the Activities of Urease and Catalase in Soil from Bronopol

Effects on the activities of urease and catalase from bronopol were studied.The results showed that with low concentration(1mg/kg),urease activity was lightly stimulated at first,then restrained,activated again,and recovered in the end.But catalase activity was lightly stimulated in 30 days.With high concentration(20mg/kg),urease activity was restrained significantly at first,then activated and recovered finally.But catalase activity was restrained at first,then stimulated,and then recovered.The higher concentration of urease,the greater restraining of bronopol.As for catalase activity,the higher concentration of it,the greater stimulation rate of bronopol will happen.As time goes longer,the stimulation of catalase activity turned to recover.The activities of both urease and catalase are sensitive to bronopol.