Abstract:

In order to provide scientific evidence of application in grown grass，combining with cultivating hairy vetch，the authors measured the change of soil organic，nutrition，and enzyme in plough layer，which was classified by cultivated-hairy vetch，grown-grass for 2，4 and 6 years，and the clean-cultivated apple orchard. The result showed that the plough layer，combined with hairy vetch and grown grass for 2，4 and 6 years，were higher than the control in aspects of soil organic matter，total N，available P and K，the microbial respiration and activity，and the number of active microbes. There were relatively differences in enzymes. The activity of the catalase was apparently lower than the control in rown grass for 2 years，comparing with grown grass for 4 years and grown grass for 6 years. The activities of phosphatase，urease and sucrose were notably higher than the control，yet rare individuals were indistinct. The carbon utilization capacity was lower than the control，including most individuals were not notable. However，other two types of soil were higher than the control in the carbon utilization capacity，and the difference reached the significant level or the super significant level. The results indicated that the method of planting hairy vetch and growing grass could help improve the soil fertility.

Key words: apple, orchard；, hairy vetch, soil nutrient, enzyme activities, microbial characteristic