You may call it dirt, earth, or soil. Regardless of what term you use, it is a substance that is vital to our existence. Soil is where we plant our food crops, but we may rarely think about what it is. In this program, we talk to George Altgelt, an expert in soil biology, about what makes up soil, why it is important, and what we should feed it. It is information every serious gardener needs to know.
