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The experiments were carried out to select the highest yield and good quality of the oyster mushroom (Pleurotus sp.) strain for breeding material sources. The strains used covered 6 from 4 countries, No. 2063, 2078 and 2093 were collected from Korea, No. 2068 introduced from Japan. No. 2091 from Germany and No. 2095 from Taiwan. Some characteristics of the strains are as follows. 1) The optimum temperature for strains, 2091, 2093 and 2063 of P. ostreatus was 30℃, it ranged from 25 to 30℃ for the others. 2) The optimum moisture content were 70 o for strain 2068, 80% fur strains 2093, 2095 and 2091, 75% for other strains. 3) The optimum pH of the mycelial growth were at pH 6.0 for strains 2093 and 2068, pH 6.0 and pH 8.0 for other strains. 4) The days from spawning to budding was the shortest in strain 2095 and the yield was the highest in 2091, 64.4㎏/3.3㎡ on the rice straw cultivation.
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