Question

Why is volcanic soil (andisol) fertile?

Answer 1

Andisols are not highly weathered but rich in trace elements

Explanation:

Since volcanic eruptions are rich in terms of iron, sulfur, copper, zinc, etc., andisols are rich materials in terms of these elements. They have low bulk density in the upper zone. The trace elements are critical in plant since plants do not produce higher yield when they are not present in soil in needed quantities.