There are several types of sulfur-containing soil amendments: elemental sulfur, ammonium sulfate, and other sulfates. It's important to know which one to use since their effects can be very different!
Elemental sulfur sources are highly acidifying. This can benefit your crops under alkaline soil conditions, but hurt them under acid conditions. This compound is typically used for pH correction, not to remedy a sulfur deficiency in soil with a healthy pH.
Other sulfate sources can be either acidifying or neutral in reaction. Ammonium sulfate is an acid-forming material; most other agriculutral sulfur salts including K-Mag, potassium sulfate, and calcium sulfate are neutral materials and don’t affect soil pH. Epsom salt is another neutral sulfur compound, although its main purpose in gardening is usually to alleviate magnisum deficiency.
Another common sulfur-containing soil amendment is gypsum (calcium sulfate), which is used as a pH-neutral conditioner to promote structure in high-clay, dispersive soils and remediate high-sodium soils. Since gypsum contains calcium, it should be used with caution in high calcium soils.
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