Soil erosion.
Soil erosion is the displacement of the upper layer of soil and can be caused by wind, water or anthropogenic activities such as soil tillage. It can be measured in the field, by Observing visible evidence of soil loss , in complement to the measure of topsoil soil organic matter. In identified cases of soil erosion , it is recommended to implement different assessment methods, such as the USLE method, the synthesis of satellite imagery and its metadata, or direct measurement of erosion in gullies, rills, sheet wash, landslides using erosion pins, sediment yield downhill or in drains using Gerlach boxes, or undercutting of the soils around trees and fence-lines.