What is the term for dead organic matter that enriches the soil?

Humus refers specifically to the rich, dark organic matter that forms in the soil when plant and animal matter decomposes. It is a crucial component of healthy soil because it improves soil fertility, enhances water retention, and promotes beneficial microbial activity. Humus is the end product of the decomposition of organic materials, and it is highly valuable for enriching the soil, providing essential nutrients to plants, and supporting a diverse ecosystem.

Compost, while related, is a broader term that encompasses a variety of decomposed organic materials that can be intentionally created by humans for the purpose of enriching garden soil. While compost does contribute to the nutritional value of the soil, it is a process and practice rather than a specific term for the end product found in natural soils.

The terms "matter" and "organic material" are too general to accurately describe the specific enriched form of decomposed organic matter found in healthy soils. Though these terms may refer to components of humus or contribute to the soil's organic content, they do not capture the specific vitality and characteristics of humus itself.