How is elemental sulfur different from other sulfate amendments?

Elemental sulfur sources are highly acidifying. This can benefit your crops under alkaline soil conditions, but hurt them under acid conditions. Other sulfate sources can be either acidifying or neutral in reaction. Ammonium sulfate is an acid-forming material; K-Mag, potassium sulfate and calcium sulfate are neutral materials and don’t affect soil pH. Another common sulfur-containing soil amendment is gypsum, which is used as a conditioner to promote structure in high-clay, dispersive soils and remediate high-sodium soils. 

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