| To investigate the nutrient quality characteristics of different soil types in the cultivated areas of northern Anhui, this study utilized data from the geochemical survey and evaluation of land quality in Qiaocheng District, Bozhou City, Anhui Province. A comparative analysis of nutrient content differences between typical fluvo-aquic soils and Shajiang black soils in northern Anhui was conducted. By employing single index nutrient evaluation, principal component analysis (PCA), soil quality index assessment, and a constraint degree model, the nutrient quality and limiting factors of these two soil types were systematically analyzed. The results indicate that the contents of P, K, trace elements, and oxides are higher in fluvo aquic soils than in Shajiang black soils, whereas Shajiang black soils exhibit higher levels of soil organic matter (SOM), N, and cation exchange capacity (CEC). The soil quality index assessment reveals that the overall nutrient quality of both soil types is moderately high. However, both require improvement in SOM, N, and S levels. Additionally, fluvo-aquic soils need enhanced CEC to improve nutrient retention capacity, while Shajiang black soils require increased Mo to compensate for the inherent deficiency of the parent material. The constraint degree model identifies S, SOM, and N as major constraints for fluvo aquic soils, and S, SOM, N, and Mo for Shajiang black soils. Principal component analysis further reveals that B, K, Zn, and Mn in fluvo aquic soils, and K, Zn, Mn, Cu, and MgO in Shajiang black soils have potential regulatory effects on nutrient quality. For regional soil management, it is necessary to integrate the remediation of major constraints with the regulation of key factors, and to establish a multiindex synergistic management system for soil nutrient quality. This study provides a scientific basis for the sustainable development of soils in northern Anhui. |