الفهرس 
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Abstract
Cultivation of oyster mushrooms is a growing concern because of their low water and carbon footprints, high nutritional value and high content of nutraceuticals. Oyster mushrooms are cosmopolitan fungi, belonging to the genus Pleurotus that grow on dead organic matter in the tropical and temperate regions. They can be cultivated on high-cellulose wastes.
the spent mushroom substrate (SMS) can serve as a biofertilizer by virtue of its content of beneficial microorganisms that avail plant nutrients from natural sources, thus representing a safe and economic alternative to chemical fertilizers.
The present work involves a mycological study and a higher plant study.
The mycological study investigates the effect of supplementation of rice straw with phosphorus on mycelial growth, yield and performance of two oyster mushrooms: Pleurotus pulmonaris and P. floridanus. The effect of 0–10 mg P/g straw DW was tested either in the form of inorganic P (KH2PO4) or organic P (phytin of wheat bran) in the presence of or without an agar layer above the straw surface on mycelial growth of the two oyster mushrooms. Consequently, the effect of inorganic P at 2 mg/g straw DW was tested on yield and biochemical composition of the two mushroom species. In the higher plant study, the effect of SMS, either the native form or that amended with P, was evaluated on growth and performance of wheat (Triticum aestivum L.) under the impact of 150 mM NaCl salinity.
Mycelial growth was better with bran than with KH2PO4, particularly in absence agar, and this pattern was more evident on P. pulmonarius than on P. floridanus. The presence of agar layer above straw improved fungal growth, particularly P. floridanus with KH2PO4.
Addition of P to rice straw increased phenolic content particularly in P. pulmonarius. By contrast, the effect of treatments was non-significant on the flavonoid content.