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How do green manures help prevent soil erosion?

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A row of cattle with brown and black coats eat feed from a long trough in a South African feedlot, separated by wooden fencing. — Feed Feedlot cattle eating grain in an intensive animal farm in South Africa.

Green manures help prevent soil erosion by acting as a protective layer for the land, often serving as a winter cover crop during seasons when cash crops are not being grown.123

By establishing a vegetative presence on the soil surface, these crops—typically annual grasses or legumes—shield the ground from the erosive forces of wind and water. Furthermore, the root systems of these plants help anchor the soil, improving its physical condition and structural stability. When these crops are eventually plowed under, they also contribute organic matter to the soil, which further enhances its quality and resilience against degradation.124536