If you need sulfur .... I have read where Ammonium Sulfate is the most soil acidifying form of Nitrogen you can apply. If you did not want to lower your soil PH, how well does Gypsum perform as a sulfur source? Calcium Sulfate verses Ammonium Sulfate?
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Edited:Â Apr 13, 2017
Sulfur - Ammonium Sulfate or Gypsum?
Sulfur - Ammonium Sulfate or Gypsum?
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Man, do I have a lot to learn. http://msue.anr.msu.edu/news/gypsum_offers_an_economic_source_of_sulfur_for_deficient_soybean_acres
Potassium sulfate might be an option from this article.