This study revealed successful use of industrial wastes to blue oyster mushroom cultivation as an easy method in Iraq. Some characteristics of yield were calculated using four substrates; S1 (100% wheat straw), S2 (100% cardboard), S3 (50% wheat straw and 50% cardboard) and S4 (30% wheat straw and 70% cardboard), using two capacities of bags 30×50 cm and 25×20 cm. The best total yield performance was 136.3 g/bag by S2 in big bags; also, the best significant (P
Key words: cardboard, cultivation, paper wastes, Pleurotus ostreatus, yield.
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