PURPOSE: To obtain a yield increasing agent for shortening (one month) a culture cycle of mushrooms, always harvesting maximum yield by blending Kanumatsuchi with vermiculite, edible oil, barley, soybean flour and rice bran.

CONSTITUTION: Kanumatsuchi is blended with vermiculite, edible oil, barley, soybean flour, rice bran and preferably rock wool to give the objective yield increasing agent. Mushrooms are cultured in a medium containing the yield increasing agent, water and sawdust.