Comprehensive Evaluation of Soil Nutrients in Lijiang Tobacco-planting Area

Based on the 521 soil samples data from 2011 to 2013 in Lijiang, the methods of principal component analysis and membership function of fuzzy mathematics were used to estimate the status of soil fertility by means of estimating integrated fertility index. The results showed that pH value was generally moderate. The average content of soil organic matter content was 40.35 g/kg, which was sufficient. Soil total N and available N were slightly high. Soil total P and available P were generally sufficient. Soil total K and available K were high. The average of integrated fertility index was 0.646, soil with fertility at medium and higher grade accounted for 85.99%.