The effects of fertilization treatments on soil bulk density

soil structure

soil porosity

soil water physical properties and contents of SOM

soil N and soil P2O5 are studied based on the 18 years long-term experiment on chestnut-cinnamon soil in loess hilly. The results show that the long-term organic fertilizer application helps maintain and improve the soil pore conditions

to bring about formation of water stable aggregate

and improve soil water infiltration and water-holding capability. Soil physical properties in treatments of inorganic fertilizer ap- plication are better than them in the treatment of no fertilization

but are worse than them in the same treatments at beginning of the experiment conducted. The application of both organic and inorganic fertilizer helps reduce the bad effect of inorganic fertilizer on soil physical property. The soil physical properties in the treatment of no fertilization are tending to deteriorate. Contents of SOM

soil N and soil P2O5 are increased significantly in the treatments of organic application only and applications both organic and inorganic fertilizer

but the effects of the later is better

and the effects of inorganic fertilizer application are not significant.