Soil and ash are not typically used by humans to aid digestion. Some cultures from Africa and Asia have eaten soil, but it's not safe or necessary. 
In animals, soil and ash may play a role in digestion by providing minerals or acting as grit to aid in the mechanical breakdown of food in the stomach. For humans, the minerals needed for good digestion are typically obtained from a balanced diet.
Eating soil or ash can be harmful to humans and cause infections, exposure to toxins or heavy metals, and gastrointestinal blockages. Health experts discourage this practice.
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