Oyster mushroom farming has been picking up in Katihar district for the past 3-4 years.The gestation period as well as critical input cost for oyster mushroom farming is less, compared to milky white and button mushrooms. Oyster mushrooms get ready for harvesting in 20-25 days. The oyster mushroom is sold at Rs200/kg while milky white mushroom is available at Rs300/kg and button mushroom at Rs150-200/kg.

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Mushroom farming is also good for landless people as well as residue crop management, besides, keeping the ECOLOGY and Environment safe. The burning of crops residue such as stubble of maize, wheat and paddy causes ENVIRONMENT POLLUTION. But, stubbles are used in the mushroom farming.