Soil Fertility in the Three Gorges Reservoir Area

The difference of soil fertility is obvious in the three gorges reservoirarea. The difference of fertility level of the main purple soil , rice soil and yellow soil is bigg. The comparative results of fertility of different soil types show that the contents of N and P in the yellow soil is higher than those in rice soil and purple soil; the contents of K,alkaline N,available P,available K in purple soil is higher than in yellow soil and rice soil. The analysis of correlation of the main soil types make it clear that the contents of N and alkalization N are related in rice soil and yellow soil. The quality analysis result of fertility of soils make it clear that fertility of soils are different in different counties and soil types in the three gorges reservoirarea.