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Soil nutrient and fertility are two important factors of the recovery of agricu ltural production in remote and impoverished area. The study of small watershed of Yiliang County Dazhai village is carried out by researching on soil fert ility of different land use , and evaluating the soil fert ility by comprehensive index. The results showed that the soil in this area was mainly acid ic and weak acid, organic matter, total nitrogen, total p hosphorus and cation exchange capacity was very high. Total potassium, alkali solution nitrogen, available potassium was in the medium level, while the available phosphorus was in the lower level. The relat ionship of soil fertility coefficient in this watershed was that the dry land area (1.32) > forest land (1.24) > paddy field area (0.96). It means that soil fert ility of dry land was the best, while soil fertility of paddy field was the worst, and soil fertility of forest land was in the middle level. Based on the “soil fertility diagnosis and evaluation of arable land in the South” (NY/T1749-2009), these three different areas were all in the second level. Effective phosphorus was a key limiting factor.

Assessment on Nutrients and Fertilities of Soils in Different Land Use Types within Dazhai Village Watershed in Yunnan Province, China