Gypsum is a common additive in mushroom cultivation used to improve the structure and nutrient
balance of substrates. This article explores the different types of gypsum available and identifies the
best type for mushroom cultivation.
Several types of gypsum can be used in mushroom cultivation:
1. Agricultural Gypsum: This is a common type used in mushroom cultivation. It is finely ground and easy to mix with substrates. These names are often interchangeable with terms like gypsum powder, but there can be a difference in consistency
2. Pelletized Gypsum: This type is formed into small pellets, making it easier to handle and
spread. It dissolves slowly, providing a steady release of calcium and sulfur.
3. Gypsum Powder: This is a finely ground form of gypsum, similar to agricultural gypsum. It is what we use, and is the purest type of gypsum available. It is 97% purity and very soluble in water. It is labeled as lab grade due to the purity, and way it is packaged.
Agricultural gypsum and gypsum powder are the most commonly used and effective types for
mushroom cultivation.
Benefits of Gypsum:
Improves Structure: Gypsum prevents the substrate from becoming too compact, enhancing aeration and water retention.
Provides Calcium and Sulfur: These essential nutrients support strong mycelium growth and healthy mushroom development.
pH Buffering: Gypsum helps maintain a stable pH in the substrate, creating a more favorable environment for colonization.
Using gypsum can significantly improve both the quality and productivity of your mushroom substrates.
Dosage: Apply approximately 5–10% gypsum by weight of the dry substrate. For example, if you’re preparing 10 pounds of dry substrate, add 0.5 to 1 pound of gypsum. Correct dosage is key to effectiveness.
Mixing: Ensure the gypsum is thoroughly mixed into the substrate for even distribution.
Preparation: If using pelletized gypsum, allow time for it to break down and integrate fully before inoculation.
Proper application of gypsum creates an optimal environment for mushroom growth and maximizes yield.
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