You would expect the cation exchange capacities of Ultisols to be lower than those of Aridisols if the soil textures are about the same.

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Ultisols are highly weathered soils that typically have lower cation exchange capacities than Aridisols, which are generally less weathered. The soil texture alone may not be the only factor affecting cation exchange capacity, but in this scenario, assuming the soil textures are about the same, Ultisols would have lower cation exchange capacities.

You Would Expect the Cation Exchange Capacities of Ultisols to Be