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Indonesia produces a large amount of oil palm empty fruit bunch (EFB) that has potency used as media for mushroom cultivation. The research emphasized the use of EFB to grow oyster mushrooms as an alternative for delignification without chemicals. This research aimed to study the growth of oyster mushroom (Pleurotus ostreatus) at EFB based growing media treatments. The media consisted of a mixture of EFB and sawdust at the composition of 0%, 25%, 50%, 75%, and 100%. The media were also supplemented with rice bran, CaCO3, and TSP fertilizer. The data were collected on the mycelium growth and the mushroom weight. During cultivation in baglog, there was no difference in mycelium growth rate. The EFB composition of 25% showed faster growth among the other compositions, followed by the EFB composition of 50%, 75%, and 0%. The highest Biological Efficiency Ratio (BER) at 56.25% was obtained at media composition of 50%. The EFB contained in baglog also showed biodelignification process. Biodelignification has the benefit which can reduce the use of chemicals in the delignification process to convert EFB into cellulose. The highest lignin reduction (40.12%) occurred in 75% of EFB media composition, while hemicellulose (49.56%) occurred in 100% EFB media composition. [ABSTRACT FROM AUTHOR]

Oil palm is one of the most important oil crops in Indonesia. Oil palm empty fruit bunch (EFB) could serve as an alternative and cheap media for edible mushroom cultivation. This study investigated the possibility of using EFB for cultivating edible mushroom Pleurotus ostreatus . The objectives of this research are to formulate best media for Pleurotus ostreatus cultivation, to give alternative for palm oil Industries to use EFB for mushroom cultivation, and to support Indonesian government policy to increase food security. The experiment, which covered the media preparation, inoculation, incubation and harvesting used different EFB media composition. Media formulation consisted of EFB, rice bran, CaC 2 , mineral fertilizer (TSP 12-12-12), and sawdust. The starter was added to the sterilized media. The experiment was done in three replicates. Data were collected on mycellium growth and weight of mushroom yield. Variation 3 showed the fastest growth of mycelium among other variations. Variation 1 yield the highest weight with 289.7 g in the first harvest. [ABSTRACT FROM AUTHOR]