What is the most cost-effective method to control soil erosion?

Preserving existing vegetation is considered the most cost-effective method to control soil erosion because it takes advantage of the natural protective cover that plants provide. Vegetation roots bind the soil together, reducing the likelihood of soil being washed away by water or blown away by wind. Additionally, plants intercept rainfall, which diminishes the impact of raindrops on the soil surface, further minimizing erosion.

By maintaining existing vegetation, there is also no need to invest in additional materials or extensive construction methods, thus saving on costs. Implementing drainage systems, applying mulch, and constructing terraces can be beneficial for controlling erosion but often require significant financial investment, ongoing maintenance, or both. These alternative methods can enhance erosion control but may not be as economical or easy to implement as preserving the natural vegetation that is already present.