target upgrade, page-39

For what its worth:


Gypsum (CaSO4.2H2O) is well recognized in world soil literature, based on its purity and commercial
value, gypsum is commonly used in agriculture as conditioner to offset sodicity problems by
improving soil structure. However, there are differences between gypsum and anhydrite materials.
Anhydrite is 21% lighter in weight than gypsum. The relatively high solubility and light weight of
anhydrite compared to gypsum means that its use is more economical and effective as less material and
time will be required for reclamation, thus providing benefits to farmers.