The formula of compost plays a decisive role in the growth and yield of Black fungus. Through years of experience, the recommend compost formula of Black fungus in Beijing is listed as follow:
Thick birch sawdust 30%, thin birch sawdust 56%, bran 10%, soybean cake powder 2%, gypsum 1%, lime 1%. For rice chaff, the formula is birch sawdust (The proportion between thin and thick is 2:1) 80%, rice chaff 16.5%, soybean cake powder 2%, gypsum 1%, lime 1%. (Source: Beijing Agricultural Technology Extending Stations)