If you want to grow azaleas in a soil that initially has a pH of 6.5 and have been told that you should apply sulfur to reduce the soil pH,you would likely need more sulfur if the soil is a clay Vertisol than if it is a clay Ultisol.

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Clay Vertisols have a higher cation exchange capacity (CEC), meaning they can hold onto more nutrients, including sulfur. Therefore, more sulfur may be needed to reduce the pH in a clay Vertisol compared to a clay Ultisol with a lower CEC.

If You Want to Grow Azaleas in a Soil That