Assertion: mushroom's ingredient | /r/HasProperty | straw
Facets:
Source sentences:
text: In fact, the most commonly cultivated mushroom, Agaricus bisporus is grown on a pasteurized compost substrate, not raw manure (common raw ingredients in mushroom compost are horse manure and straw).
text: In the Netherlands, this culture medium is made with the following ingredients: straw, poultry and horse manure, gypsum and a lot of water.