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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.
Soil. 1  Copper sulfate can dissociate or dissolve in the environment releasing copper ions. 2  Copper accumulates mainly at the surface of soils and it can persist because it has a tendency to bind to organic matter, minerals, and some metal oxides. 3  The more acidic the soil, less binding occurs.