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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.
Undo. bpgreen (5UT). If your soil pH is high, it's unlikely that adding iron shavings will help. The iron in those shavings is not in a form that the plants will be able to use in a high pH environment. It's likely that there is already plenty of iron in your soil, but the plants can't take advantage of it.f you want to add iron to the soil, you need to add chelated iron. With a pH of 7.4, you may be able to use EDTA chelated iron, but you'll probably have better luck with EDDHA chelated iron.