Soil with a pH under 7, such as podzols and brown earths. Acidity in a soil may be due to the leaching out of cations when precipitation exceeds evapotranspiration. Other factors include the nature of the vegetation (and thus the humus) and of the parent rock. Adams and Evans (1989) Eur. J. Soil Sci. 40, 3 propose a model of soil acidification.
Subjects: Biological Sciences — Earth Sciences and Geography.