To investigate the variations of soil electronic conductivity,invertase activity,urease activity and crop yield,we established a field location experiment with the wheat cultivar “xinong 889”and corn cultivar “zhengdan 958” under the rotation of wheat and corn.The fertilizer treatments included the control (CK),straw (S),straw+manure (SM),straw+urea (SN) and straw+urea and superphosphate (SNP).The results showed that:(1)Soil electronic conductivities in all treatments had a downward tendency.The average of soil EC decreased in the order straw+urea+calcium superphosphate (SNP)>straw+urea (SN)>straw+manure (SM)>straw (S)>CK,and their differences were significant.(2)Straw with chemical fertilizer could promote the mineralization of organic matter.Soil invertase activities and urease activities have the highest values in the SN treatment.The peak value of invertase was 70.62 mg·g^-1·d^-1,which was 1.36 times greater than that in CK.The peak value of urease was 3.58 mg·g^-1·d^-1,which was greater than that in CK by 9.15%.The straw with N and P fertilizer could increase soil invertase and urease activities.(3)Soil organic C was highly significant in the S,SM treatments compared with the CK,SN and SNP treatments.But there were not significant differences between the S and SM treatments.Soil organic C was 8.91% greater in the SM treatment than that in CK.(4)Straw with manure could increase soil organic carbon contents.There were significant differences in soil total N contents among all treatments,SNP first,SM second,S,SN took third place.Soil total N in the SNP,SM,S and SN treatments were larger than that in CK by 19.8%,11.1%,9.88% and 7.41%,respectively.(5)Crop yields in the fertilized treatments were significantly different with CK.The highest of wheat yield was in the SNP treatment,which were greater than that in CK by 50.6%.The highest of cron yield was in the SN treatment,which were greater than that in CK by 34.3%.The fertilizer application increased soil nutrient content,enhanced soil enzyme activities and raised crop yield.