![]() ![]() Shiitake mushrooms can be harvested every winter for five years. ![]() In winter, the shiitake mycelium produces about 100 to 150 fruiting bodies per log. During growth, the shiitake mycelium absorbs nutrients by decomposing polysaccharides such as cellulose, hemicellulose and lignin. Shiitake mycelium grows and expands in the log in an environment where the water content and temperature of the log is changing. Logs are placed outdoors (typically in the open forest) and through sunlight, rainfall and watering are repeatedly dried and absorb liquid water. In log cultivation, Quercus serrata is cut down in autumn, the logs are dried outdoors in winter, and they are inoculated with a strain of shiitake mushrooms in the spring (Przbylowicz and Donoghue 1988 Wasser 2005 Tokimoto 2010). In Ishikawa Prefecture, shiitake mushrooms are cultivated on native Quercus serrata logs. About 8% was cultivated using hardwood logs. The total amount of fresh shiitake mushrooms produced in Japan in 2019 was 71,000 tons (MAFF 2019). Based on observation of water penetration into logs by magnetic resonance imaging (MRI) and an optical microscope, it is believed that the driving force behind liquid water rising in the longitudinal direction in the test log is the capillary force acting on a three-phase interface consisting of the inner wall surface of the vessel, liquid water and air. On the other hand, the D eff of the moldy logs were 6.7–9.7 × 10 –10 m 2/s, which was 0.058–0.081 times that of dry test logs. The D eff of test logs in which shiitake mycelium grew were 1.5–3.4 × 10 –8 m 2/s, and the values were 2.4–4.7 times higher than that for the dried log. The effective diffusion coefficient, D eff, was calculated from the change in time of the water uptake mass using Fick's diffusion law. Water uptake mass of the test logs was measured for 20 h. Liquid water was supplied to the test logs by placing the longitudinal direction of the test logs along the line of gravity and immersing the bottom of the test logs in water. In this study, six test logs ( Quercus serrata, diameter of 38–48 mm, length of 110–118 mm) were used, of which some were dried, some had shiitake mycelia grown on them, and some had mold generated on them. In the cultivation of shiitake mushrooms ( Lentinula edodes), the farmer needs to know the time needed to water in order to adjust the water content of the logs. ![]()
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