Fertilizer: While In the late 18th and early nineteenth centuries, Nova Scotia gypsum, often referred to as plaster, was a hugely sought fertilizer for wheat fields in America. Salt Flats: Gypsum is a standard part of salt flats, that are expansive, flat spots using a salt crust around the area. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050