Spodosols are highly acidic soils that form in coniferous forests. Water leaching through these
soils becomes acidic, which causes heavy weathering of the lower horizons in the soil. Much like the oxisols, this leads to high concentrations of aluminum and iron in the subsurface horizons. These soils have a very low fertility for any kind of crop other than trees that favor acidity like pines. The Northeastern U.S. and the Upper Peninsula region of Michigan are where these
soils are found in the U.S.