Concept:Soil erosion is reduced by farming and conservation methods that keep the soil covered or hold it in place.Explanation:Contour ploughing follows the shape of the land and slows water flow.Cover cropping protects the soil surface with plants.Afforestation involves planting trees, which bind the soil with roots.Deforestation is the removal of trees and vegetation.Removing trees exposes the soil and increases erosion, so it does not control soil erosion.Answer:Deforestation.