Effect of Long Term Fertilization to the Accumulation and Distribution of Phosphorus at Different Layers of Cinnamon Soil

The results of 15 years experiment of long-term fertilization in cinnamon soil upland showed that the contents of total phosphorus,organic phosphorus and rapidly available phosphorus were improved significantly in 0～40 cm soil under the methods of combined application of organic fertilizer and inorganic fertilizer and using organic fertilizer only.Applying inorganic fertilizer for long term increased contents of soil total phosphorus,organic phosphorus and rapidly available phosphorus in 0～20 cm soil.Long-term fertilizer mainly increased contents of total phosphorus,organic phosphorus and rapidly available phosphorus in 0～20 cm soil.And the layer distribution of phosphorus was changed with the different methods of fertilizer application.