When we talk about soil depletion, which soil horizon are we talking about? Thank you

Surface Horizon (A)

Nutrient depletion of soils is a widespread soil degradation phenomenon that occurs as a consequence of soil erosion (it is the topsoil in which generally most soil nutrients are present that erodes fastest) but also because of poor management practices, such as slash and burn and other subsistence agricultural.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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