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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.
Generally speaking, clay soil is not necessarily more acidic than sandy or loamy soil. Clay defines the soil's texture, not its acidic or alkaline pH level. However, clay soil acts acidic in a number of ways even when it is not actually acidic, and there are some cases where the two properties are connected. The power of hydrogen, or pH, measures whether a liquid is an acid or a base by determining how many hydrogen atoms it has.