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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.
Soil pH tends to be higher (more alkaline) when the soil is cool, and lower (more acidic) in summer, when increased bacterial activity in warmer weather has an acidifying effect on soil. Factor this in when changing soil pH.