Hay and Straw are the main ingredient for mushroom compost
According to Pennsylvania Sustainable Agriculture Association (PASA), "contrary to what some might think, manure is not the main ingredient in mushroom compost. While manure is a component of the recipe, the main ingredients are hay and straw."
Below is a list of mushroom compost, the growing medium for mushrooms.
- 40-50% Hay
- 25-35% Straw
- 5–15% Straw horse bedding
- 4% Poultry manure
- 2% Gypsum
- 1% Corn cobs, cocoa shells, cotton seed hulls
Mushrooms primarily consume lignin and carbohydrates as they grow, "leaving the resulting N-P-K values in mushroom compost mostly unchanged from the starting formula." Since no nutrients are lost during the sprouting of mushrooms, it may be beneficial to return the mushroom compost to the fields of Northampton County once the mushrooms are harvested. Dr. Reiter has been researching this idea for the benefit of the fertility of our soil on the Eastern Shore of Virginia.