"Soil is the living skin of the earth. It is the most diverse and life-rich medium on this planet, and all things spring from and return to it. Soil is created through many physical, biological, and chemical processes. Clay, sand, and silt are commonly seen as the primary components of soil, but organic matter and the soil food web are as vital, if not more critical, for growing food and supporting life than the ratios of the clay to sand to silt—though understanding it all is critical" (The Permaculture Student 2, p. 75).
Recommended Reading & Workbook Activities
The Permaculture Student Workbook p. 16-21 (soil tests)
The Permaculture Student 1 p. 23-28
The Permaculture Student 2 p. 75-133 (in-depth soil & fungi study + more soil tests)