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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 with alkaline and neutral pHs have more calcium present. Water drains quickly through sandy soils. So sandy soils quickly lose their calcium content, because of this leaching.And so they tend towards the acidic ranges of soil pH.oils with alkaline and neutral pHs have more calcium present. Water drains quickly through sandy soils. So sandy soils quickly lose their calcium content, because of this leaching.