Although at a slightly higher significance level than other metals, the nickel (Ni) p-value (0.038) between maize and spinach indicates a significant difference in nickel absorption. Maize shows a slightly higher uptake of nickel than spinach, suggesting differences in nickel accumulation patterns in different plant species. The Iron (Fe) pvalue (<0.001) indicates a substantial variation in iron absorption between spinach and maize. Specifically, maize absorbs more iron than spinach, suggesting possible variations in the two crops' methods of iron uptake and use.