These experiments were conducted to search for the optimum composition of media material and media size for vinyl bag culture using sawdust. Considering the incubation period and the successful culturing rate, the optimum media size was length 25cm diameter 14cm (weight 2.5kg). The saturation moisture amount of Oak sawdust was 251㎖/100g. It is a half of pine sawdust 495㎖/100g. In 10 treatments of media construction including Oak sawdust 100%, the optimum material mixing rate was Oak sawdust 80%+wheat bran 20% and Oak sawdust 80%+ bran 20% considering the hypha growing speed and hypha density. The optimum moisture amount in media for growing Lentinus edodes was 55%. Injection pipe with 20 holes in media was reduced the incubation periods to 11 days when 20cm length media and 32 days when 30cm length media. The best method for browning media surface was above 10℃ of hematocryal and punching the vinyl bag. This treat could shortened the browning periods to 54 days.

• Choi Duck Soo(Crop Research Division, Jeonnam Agricultural Research and Extension Service, Naju 520-715, Korea)
• Jung Kyung Ju( Crop Research Division, Jeonnam Agricultural Research and Extension Service, Naju 520-715, Korea) | Jung Kyung Ju