What is the main purpose of applying mulch in erosion control?

Applying mulch in erosion control primarily serves to protect the soil surface, retain moisture, and promote vegetation growth. This is crucial in preventing erosion, as bare soil is highly susceptible to being washed or blown away by water or wind.

By covering the soil with mulch, it acts as a physical barrier that mitigates the impact of rain, reducing the velocity of water hitting the soil surface and thereby minimizing soil displacement. Additionally, mulch helps retain moisture in the soil by reducing evaporation, which is essential for maintaining healthy plant growth. By fostering vegetation, mulch plays a significant role in establishing root systems that further stabilize the soil, making it less prone to erosion.

While mulch can have secondary benefits, such as raising soil temperature and potentially influencing pest populations, its primary function in the context of erosion control is centered around protecting soil and enhancing water retention to support plant life.