Objective This study aims to find out the soil fertility level and nutrient characteristics in tobacco-Planting soils of Tieling area, in order to provide a foundation for the conservation and improvement of these soils.
Method The farmland soils of three tobacco-planting areas (Kaiyuan, Xifeng and Changtu in Tieling were collected as research materials, and their basic physical and chemical indices were determined. Then, the fertility levels of local tobacco-growing soils were evaluated though the principal component analysis method and fuzzy mathematics comprehensive evaluation method.
Result The results showed that: (1) The plough layer of soil in tobacco-planting area was shallow. (2) Soils were serious acidized with relatively low contents of organic matter and total nitrogen, excessive phosphorus, non-equilibrium potassium and deficient trace elements. (3) The comprehensive soil fertility index (IFI) ranged from 0.30 to 0.79, with an average of 0.59. All the tobacco areas were dominated by the grade II and grade III. (4) The soil fertility level of the three tobacco-growing areas from high to low was Kaiyuan > Xifeng > Changtu.
Conclusion The levels of soil fertility are decreasing in the tobacco-planting area of Tieling due to the soil degradation by the plantation of tobacco.
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