Reuse of degraded Pleurotus ostreatus (Jacq.) P. Kumm. substrate by supplementation with wheat bran. Quantitative parameters

This research work was conducted in order to investigate the agronomic feasibility of Pleurotusostreatus by reusing spent substrates previously in crops of the same mushroom. After the physical and chemical characterization of the substrates, we have evaluated quantitative production parameters in one growing season. As base material, the experiment was arranged in wheat straw (WS) and spent Pleurotus substrate (SPS) to generate prepared substrates with the participation of the same, alone, and mixed in different proportions with wheat bran (WB). Unsupplemented SPS, supplemented SPS with 600 g of WB, mixture of WS + unsupplemented SPS, and mixture of WS + supplemented SPS with 600 g of WB, are prepared substrates with biological efficiencies (BE) ranging between 41 and 66% and an excellent unit weight of sporophores harvested. All correlations established among the germination index (GI), earliness (expressed as days to first harvest), yield components and BE were significant and positive correlation coefficients expressed.