Fertilizer: Within The late 18th and early 19th centuries, Nova Scotia gypsum, frequently known as plaster, was a very sought fertilizer for wheat fields in the United States. Deposition: Gypsum at first forms as dissolved calcium and sulfate ions in h2o. These ions can come from a number of sources, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050