Dynamic Changes of Main Nutrients in Tobacco-planting Soil Under Different Green Manure Application

In order to investigate the effect of different green manure application on soil main nutrient,a field experiment was conducted with vicia villosa,common vetch,milk vetch,ryegrass,Dongmu- 70,radish. The results showed that( 1)green manure application could improve the contents of soil organic matter,available N,available P,available K by 2. 64%- 13. 33%,19. 25%- 40. 99%,2. 32%- 18. 75%,47. 94%- 76. 50% respectively.( 2) The influence of ryegrass was biggest on the soil organic matter among different green manure varieties,and common vetch on available N and available P,and milk vetch on available K.( 3) The influence of graminaceous green- manure was biggest on the soil organic matter among different green manure types,while leguminous green manure on soil available N,available P,available K.