Effect of inorganic fertilizer combined with organic manure on soil hydrolase activities during the growth of corn

To explore the effects of inorganic fertilizer combined with organic manure on the changes of soil hydrolase activities and the correlations among soil hydrolase activities,the soil hydrolase activities of experimental field were mensurated and analyzed in Meixian County,Shaanxi Province.The results showed that during the growth of corn,the activities of soil invertase and alkaline phosphatase peaked at jointing stage,the soil urease activity had a peak at large bell stage.The activities of soil invertase,urease and alkaline phosphatase were higher in the low organic manure treatment(M1N0),middle N fertilizer treatment(M0N2) and inorganic fertilizer combined with organic manure treatment(M1N2,M2N2,M3N2) compared to the unfertilized treatment(M0N0),invertase activity in the M2N2 treatment was the highest 26.56 U,which was 48.63% higher than that in the M0N0 treatment,urease activity in the M3N2 treatment was highest at 0.80 N,which was 25.00% higher compared to the M0N0 treatment,alkaline phosphatase activity in the M2N2 treatment was the highest at 2.21 H,which was higher than that in the M0N0 treatment by 0.16 H.Significant correlation was found between the invertase and alkaline phosphatase activity(P0.05),the urease and alkaline phosphatase activity,but the correlation between the invertase and urease activity was not significant(P0.05).