Gypsum is calcium sulfate, and lime is calcium carbonate. Both are soil amendments, and both provide calcium. Only gypsum provides a source of sulfur. Gypsum is actively marketed as a soil amendment. Gypsum can be mined. Mined gypsum is a relatively pure and clean product depending on how many other...
Gypsum (calcium sulfate): how it can make degraded soils productive again
Soils in the world degrade generally from human induced activity like logging, mining, drilling (for oil or natural gas), accidental spills or farming. However, nature can also degrade soils with changes in landscape and water levels. Once soils are degraded, they are no longer productive. They cannot support natural vegetation...