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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 these soils, the iron is only available to the plant at very low concentrations. This low level of plant-available iron will cause the development of lime-induced iron chlorosis characterized by interveinal yellowing of the new growth due to lowered levels of chlorophyll.