Comparison of fertility characteristics of typical cumulic cinnamon soils profiles and soil fertility index of topsoil in different years
不同时期典型塿土剖面肥力特征与耕层肥力指数比较分析

In order to know the fertility characteristics of typical cumulic cinnamon soil profiles in different years, the soil nutrients and the temporal variation in recent 30 years were studied through the situ sampling method and historical materials. The results showed that the fertility of cumulic cinnamon soil has been improved since the 1980s. The nutrient accumulation of soil total nitrogen (TN) increased by 40.7% from the fourth class to the third class. Available nitrogen (AN) increased by 56.1% from the fifth class to the fourth class. Total phosphorus (TP) increased by 44.5% from the third class to the first class. Available phosphorus (AP) increased by 204.0% from the fourth class to the second class. Soil available potassium (AK) content accumulated 57.6 mg/kg from the third class to the second class. Soil organic matter (OM) content increased from 12.42 g/kg to 18.98 g/kg, but still insufficient (the fourth class). In order to keep the balance of soil fertility, OM content should be increased and nitrogen input should be enhanced while phosphorus and potassium should be controlled.