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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.
As a result some soils can benaturally very acidic (low pH) while others aremuch more alkaline (high pH). THE RATE OF SOILACIDIFICATION INCREASES WITHAGRICULTURAL ACTIVITIES While many NSW soils are naturally acid mostagricultural production systems increase the rate ofsoil acidification.