Soil Humus Home » Build Soil » Humus Humus — where life in the soil creates more life. Learn how to measure and build your humus — and why that matters. How is Humus Formed? Learn about the basics of soil humus — how it’s formed and its place in a healthy soil ecosystem. Learn More… What is Humus Made Of? Organic matter, nutrients, minerals — learn the key elements that compose soil humus. Learn More… Humic Acid Understand the difference between soil organic matter and humus, and how humic acid can greatly increase soil health and production. Learn More… Healthy Soil, Defined Biological farming expert Gary Zimmer provides a definition of healthy soil and how farmers can achieve it using ecological means. Learn More… Building Humus for all Crops What makes soil humus what it is? What role do soil microbes play in the formation of humus and how does this benefit crops? Learn More… Eco-Farming Index Didn’t find the answer you were looking for? Browse through more topics realted to eco-agriculture in this section.