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Glossary

Acidic Soil

Soil acidification occurs when acids supply the soil  from outside or through internal soil processes  with more protons than the soil can neutralize. If the alkaline reaction products of the neutralization processes are washed out, acidification increases. As a result, the pH of the soil decreases. 
Soils in humid climates acidify during their formation. This natural process can be intensified by human influence.