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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.
Acidic soil is any soil with a pH balance below 7. Soils that are below 7 are acidic while those with a pH balance above 7 are considered to be alkaline. Knowing the pH balance of the soil is important because certain plants and crops grow best in a certain type of soil.