Three key elements to create rich soil: physical, chemical, biological
"And whilst investigating many articles and books on this topic, I began to understand the three key elements that play a role in creating a rich soil. These are (1) the physical, (2) the chemical, and (3) the biological." (page 18)
Kazunari Yokoyama, “We cannot end hunger without feeding the soil,” Resurgence & Ecologist, 284, (May/June 2014): 18-19.