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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.
Acidifying the Soil. 1  1. Identify your soil type. 2  2. Add organic materials to well-drained, loose soils. 3  3. Add elemental sulfur to soil that is heavily compacted or which has lots of clay.  4. Add iron sulfate to soil that is heavily compacted or has lots of 1  clay. 5. Use a fertilizer containing ammonia.