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SciTech
Cultivating shitake mushroom
The medium for growing shitake mushroom in plastic bags is sawdust.
SHITAKE MUSHROOM contains high percentage of crude protein (17.5), fat (4.9), carbohydrate (67.5%), ash 7 fibre (8) on wet weight basis (silver oak or eucalyptus) plus wheat bran 5-20 per cent supplemented with 5.0 per cent tapioca tippi powder. A specially designed plastic ring is wrapped at the top end of the bag to form a bottleneck holding a cotton plug inside. Dried sawdust is mixed with wheat bran and tapioca tippi at a proper ratio and adjusted to 60 per cent moisture content.
The sawdust mixture is packed into a polypropylene bag sterilised at 90 degree to 100 degree C for 90 minutes. The bags are then inoculated and transferred to growing room, maintained at 25 degree _ 28 degree C when the saw dust is fully colonised, the plastic can be peeled off as the mycelium holds the saw dust together.
The temperature is reduced and fruiting bodies develop on the surface of the sawdust. The humidity of the cropping yard is maintained at 85-90 per cent relative humidity. Under these conditions, mushroom appears within 20-25 days. The fruit bodies, at picking time, should be young, just at the time when they begin to sporalate with a still strong convex pileus and traces of the veil visible.
The cropping period is 6-8 months and yield of 500-650 gm is per kg of substrates is expected.
The mushrooms are dehydrated at 30 degrees which is increased by 1-2 degree C per hour until a temperature of about 50 degree C is reached in 12-13 hours.
L. Mohan &
V. Paranidharan
Horticultural Research Station
TNAU, Yercaud 636 602
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