Which soil order is developed from volcanic material, particularly ash?

Andisols are a specific soil order formed primarily from volcanic materials, especially volcanic ash. They typically occur in regions with volcanic activity and are known for their unique properties, such as high water retention, good drainage, and a significant capacity to hold nutrients. The volcanic ash contributes to the formation of amorphous materials (like allophane and imogolite) that characterize Andisols, leading to fertile soils that support diverse agricultural activities.

The presence of these volcanic materials also influences the soil's chemical properties, promoting a high cation exchange capacity, which is advantageous for plant growth. This distinct origin and set of features clearly identify Andisols as the soil order specifically associated with volcanic ash, distinguishing them from other soil orders that have different parent materials.