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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.
In addition to supplying calcium, lime makes soils less acidic. Acidic soils, referred to by old timers as sour soils, have a low soil pH. Soil pH levels can range anywhere from 3.0, very acidic, to over 8.0, moderately basic, in our region.