Soil physicochemical properties and enzyme activity data under nickel–cobalt–manganese (NCM) contamination

This dataset contains soil physicochemical properties and enzyme activity measurements obtained from a controlled incubation experiment evaluating the effects of nickel–cobalt–manganese (NCM) contamination on two agricultural soils with contrasting properties (Anshida and Tongling, China). The dataset includes raw replicate measurements, processed mean values, statistical outputs (ANOVA and Duncan’s multiple range test), and normalized enzyme activity data (0–100) used for radar plot visualization. Enzyme activities include catalase, sucrase, acid phosphatase, urease, and amylase. Normalization was performed independently for each soil using min–max scaling to facilitate relative comparison among enzymes and treatments. These data support the analyses and figures presented in the associated manuscript investigating soil biochemical responses and functional plasticity under mixed-metal stress.