The soil basic fertility is low in the farming land at Yaner Gully watershed

especially in the recently built terrace lands. The soil organic matter

total N

available N and P

and CEC are all relatively low

and also the soil enzymatic activity. The available K is mediate. The soil nutrient and enzymatic activity in the dam land is relatively higher

but still in the low level which limited the crop productivity and agriculture development. The efficient way to improve soil fertility is to input large amount of organic matter

return crop straw into farmland

and plant fertility-improving crops.