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air conditioning air handling system air temperature allow ammonia amount of compost amount of fresh bacterial bed surface beds or trays Benomyl chicken manure circulation COMMERCIAL MUSHROOM GROWING compost pile compost temperature composting process contain conveyor cook-out cooling corncobs crop depends dry weight duct excessive false ceiling Figure filling and emptying flies floor fresh air growers growth Gypsum harvested heat high relative humidity horse manure hydrated lime hyphae insulation kilogram kJ/h larvae layer material milliSiemen mites moisture content molds mush mushroom farm mushroom houses mushroom mycelium mushroom production mycelium nematodes nitrogen nitrogen content nutrients Ontario organisms pasteurization peat moss period pest pesticide Phase Phorid flies pins prevent reduced refrigeration relative humidity roof saprophagous sciarid soil spent compost spores spread square metre stacked straw symptoms synthetic compost technique thermophilic tion tonne usually ventilation Verticillium Vineland virus walls