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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.
Soils are acid because of hydrogen ions dissolved in. soil solution (water in the soil) and held on the clay. and humus particles. pH is a measure of the degree. of acidity or alkalinity. A value below 7.0 is acid, 7.0. is neutral and above 7.0 is alkaline.