Based on the analytic hierarchy process and fuzzy mathematics theory

the integrated evaluation of soil fertility quality was studied at ravine regions of loess plateau in Zichang County of Shaanxi Province. And seven indexes

including soil organic matter

total N

total P

total K

available N

available P and available K were investigated in 5different types of land use.The results showed that there was significant heterogeneity in seven soil fertility indexes.According to soil fertility quality level standard of Shaanxi Province

soil organic matter contents in all the 5different land types were relative low

especially in the new manmade farmland

which was the lowest(level 8).The other indices such as total N content

soil rapidly available N and soil available P were relative low as well.The grass land and flood land held higher soil available P(level 4-5)

compared with the other land use types.The content of soil total and available K were the highest among all the indices

especially in new cultivated land and dam land.As the low content of organic matter

N and P in soil

more attention need to paid in sustainable soil fertility development in Loess Plateau.