PasteurizationThe purpose of pasteurization is to kill harmful microbes. This can be achieved in two ways.Hot water treatmentWater is boiled in wide mouth container and chopped wet straw filled in gunny bag is submersed in hot water for 40 minutes at 80-900C to achieve pasteurization. This is very popular method particularly with small growers.Steam pasteurizationWet straw is filled inside insulated room either in perforated shelves or in wooden trays. Steam is released under pressure from a boiler and temperature in side substrate is raised to 650C and maintained for 5-6 hours. Air inside the room should be circulated to have uniform temperature in the substrate.SterilizationSubstrate is filled in polypropylene bags (35x45cm, holding 2-3 kg wet substrate) and sterilized at 15 lb psi for 1 hour. Once pasteurization/sterilization is over straw is shifted to spawning room for cooling, bag filling and spawning.
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