Straw, horse manure and hay are the raw materials that have the most influence on the mushroom production process. Its structure affects the composting process. Its fibers (i.e. celluloses, hemicelluloses and lignin) are important carbon sources. The mycelium needs hemicelluloses and lignin for growth during the spawn run and case run phases (vegetative phase). In the so-called generative phase, from pin outgrow to mature mushrooms, celluloses and hemicelluloses are needed. Mushroom substrate has to undergo certain process steps. For the phase I composting process these are the so-called biological and chemical steps. During the phase II process the conversion of ammonia and the creation of selectivity make up the next step. During the phase III composting process the final step is mycelium development. Straw (or horse manure, hay) has a big impact on all these process steps.
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Article: by Geert Lemmers Composting Consultancy B.V.