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UNITED STATES DEPARTMENT OF AGRICULTURE
The cultivated mushroom 1 Growing conditions
35 cents 7,000 square feet aeration agar air space air temperature ammonium sulphate artificial compost artificial manure bacteria bed space bottle spawn burning sulphur button mushrooms cause cents per hour Chief cial Commercial mushroom composting period contaminated cost crop cyanide disinfecting emptying the beds excessive experiments favorable feet of air feet of bed Figure filling final fermentation formaldehyde gas formalin fumigating fungus gnats green mold growing mushrooms heap heat horse manure inches industry infestation insect pests layer live steam maintain material moisture content mush mushroom caps mushroom compost mushroom culture mushroom diseases mushroom growing mushroom house mushroom mycelium Mycogone Mycology nitrogen obtained plaster mold pound of mushrooms practice prevent produce pyrethrum relative humidity rick rooms soil spawn bottles spawn makers spores Springtails square foot steam sterile straw surface temperature tiers of beds truffles United ventilation yield of mushrooms