Gypsum is the common name for calcium sulfate (CaSO4). It is a greyish powder used for making cement and drywall. Gypsum is used in in grain spawn in order to keep kernels from becoming stuck together and as a pH-buffer and lightening agent in bulk substrate and casing material preparation.
Calcium sulfate will slightly acidify a substrate as sulfuric acids evolve.
References[edit | edit source]
- Stamets, Growing Gourmet and Medicinal Mushrooms (Third Edition), 2000