The given statement is true.

Humus is a dark organic material that forms in the soil as plant and animal matter decays. It is formed by the decomposition of dead plant and animal material by microorganisms and is an important component of soil. 

Humus is high in nutrients and helps to improve soil structure, fertility, and water-holding capacity. It also aids plant growth by providing essential nutrients and aiding in the retention of moisture in the soil. 

Humus also helps to protect soil from erosion by binding soil particles together and creating a stable structure. Furthermore, humus provides a home for microorganisms and other soil fauna, which play an important role in nutrient cycling and soil health.