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This interesting patent make me wonder why home shiitake growers haven?t been using this method. The substrate will be more expensive than sawdust, but the author claims yields of 300lbs from 100lbs of substrate in 5 months!
An improved substrate for mushrooms that is essentially cellulose-free comprising a major portion of grain and minor portions of nutritional supplements. The grain is partially sterilized by boiling in order to kill bacteria, cooled in order to induce germination of the heat resistant spores, and steam sterilized before the germinated spores have matured sufficiently to create new spores. The substrate can be used to grow fungi, including mushrooms, especially shiitake.