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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.
Ironite vs Ferrous Sulfate to lower pH. by bombri Â» October 4th, 2012, 9:58 pm. I just had a quick question about the difference between the typical granular form of ironite and the ferrous sulfate I had historically been using in an attempt to lower my soil's pH.To me, at first glance, the suflur content is about the same, and I believe that's what's actually lowering the soil's pH.The biggest difference, and apparent advantage in my opinion, is that ironite only has 1% Nitrogen, so it can be applied much more often than the ferrous sulfate.o me, at first glance, the suflur content is about the same, and I believe that's what's actually lowering the soil's pH. The biggest difference, and apparent advantage in my opinion, is that ironite only has 1% Nitrogen, so it can be applied much more often than the ferrous sulfate.