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Rainfall also affects soil pH. Water passing through the soil leaches basic nutrients such as calcium and magnesium from the soil. They are replaced by acidic elements such as aluminum and iron. For this reason, soils formed under high rainfall conditions are more acidic than those formed under arid (dry) conditions.
FOUR MAIN CAUSES OF SOIL. ACIDIFICATION. The four main causes of soil acidity are: â  removal of product from the farm or paddock. â  leaching of nitrogen below the plant root zone. â  inappropriate use of nitrogenous fertilisers. â  build up in organic matter. Removal of product.