| To support the precision management of secondary and micronutrients in topsoil, 427 topsoil samples from the 0–20 cm layer were collected in Xi’an, Shaanxi Province. The contents of exchangeable calcium and magnesium, as well as available iron, copper, manganese, zinc, boron, and molybdenum, were determined. Grade-based evaluation, ordinary kriging interpolation, fitting analysis, and principal component analysis were used to characterize their content levels, spatial patterns, environmental responses, and comprehensive supply status. The results showed that the mean contents of exchangeable calcium and magnesium were 2090.69 and 253.49 mg·kg?¹, respectively, while the mean contents of available iron, copper, manganese, zinc, boron, and molybdenum were 18.21, 1.81, 20.12, 1.52, 0.81, and 0.16 mg·kg?¹, respectively. Overall, the secondary and micronutrient status of topsoil in Xi’an was moderate to relatively high, but marked differences existed among districts and counties. Spatially, exchangeable calcium, exchangeable magnesium, and available boron generally exhibited patchy distribution patterns, whereas available iron, copper, and manganese showed belt-like patterns characterized by a gradual decrease from the west to the northeast. Available zinc and molybdenum showed relatively weak spatial structures, and their interpolated maps should be interpreted mainly as references for regional-scale trend identification. Fitting analysis indicated that soil pH had relatively strong explanatory power for available iron, manganese, and copper, with linear fitting R²fit values ranging from 0.225 to 0.390. Principal component analysis showed that Zhouzhi County, Lantian County, and Chang’an District had relatively high comprehensive scores, whereas Yanliang District had the lowest score. In conclusion, the overall supply of secondary and micronutrients in Xi’an topsoil was relatively favorable, but local nutrient imbalance and deficiency risks still existed. Regional management and precision supplementation should therefore be implemented according to spatial heterogeneity and district-specific limiting elements. |