Abstract: A method of sawdust-based cultivation of Shiitake (Cortinellus Shiitake) and a cultivation water tank used for the method in which a top portion of a cultivation bag which includes a cultivation bed (sawdust-based substrate) is cut to expose a top surface of the cultivation bed and water is poured into a gap between the bag and bed; and a cultivation water tank comprises a framework, water tanks arranged in the framework, sawdust-based substrates arranged in the water tank, a latticed frame, water sprinklers, an air blower and illuminators, a pump connected to the water pipe and the exhaust pipe through a pipe, exhaust pipes provided at a drain pipe so that water may not overflow onto the top surface of the sawdust-based substrates which is characterized in that water is circulated to refrain mushrooms from fruiting and growing from the side and bottom faces of the sawdust-based substrates, but to grow only from the top surface of sawdust-based substrates.

Abstract: A method of sawdust-based cultivation of Shiitake (Cortinellus Shiitake) in which a number of cultivated primordiums are decreased simply by elevating temporarily a temperature into a zone between 20 degree C. and 40 degree C. during/between a cultivation step and a growing step, thus adjusting a number of grown mushroom fruiting bodies.