Reuse of Degraded Pleurotus ostreatus (Jacq.) P. Kumm. Substrate by Supplementation with Wheat Bran: Quantitative Parameters

Summary

This research explored how mushroom growing waste could be recycled into new mushroom production, creating a more sustainable cultivation system. The study found that spent mushroom substrate can be successfully reused to grow new mushrooms, especially when mixed with small amounts of wheat bran supplement. This discovery has important implications for both mushroom growers and environmental sustainability. Impacts on everyday life: – Reduces agricultural waste and environmental pollution from spent mushroom substrates – Lowers production costs for mushroom growers by reusing materials – Decreases dependence on wheat straw, preserving it for other agricultural uses – Provides a model for circular economy practices in agriculture – Contributes to more sustainable food production systems

Background

The commercial production of Pleurotus mushrooms generates large amounts of spent substrate waste that could potentially be reused. The mushroom growing sector in Spain generates about 500,000 tons of spent compost annually, while the EU produces over 3.5 million tons. This waste material accumulates in collection centers and can be environmentally problematic if not properly managed.

Objective

To investigate the agronomic feasibility of reusing spent Pleurotus ostreatus substrate supplemented with wheat bran for new production cycles. The study aimed to evaluate if spent substrate could serve as a viable alternative to wheat straw as a base growing material, which would help reduce waste and dependence on straw.

Results

Unsupplemented SPS, SPS supplemented with 600g wheat bran, mixture of WS + unsupplemented SPS, and mixture of WS + SPS supplemented with 600g wheat bran achieved biological efficiencies between 41-66% with good mushroom unit weights. Higher wheat bran supplementation decreased yields. All correlations between germination index, earliness, yield components and biological efficiency showed significant positive correlations.

Conclusion

The study demonstrated that spent Pleurotus substrate can be successfully reused as a growing medium, especially when unsupplemented or supplemented with moderate amounts (600g) of wheat bran. These formulations provide a low-cost substrate with balanced nutrients for oyster mushroom cultivation while helping reduce waste.
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