Investigating the effects of substrate and nutritional supplements on some vegetative and reproductive characteristics of salmon oyster mushroom (Pleurotus djamor)

In this research, substrates consisting of sawdust, wheat straw, date palm leaf wastes, the combination of sawdust with wheat straw (in equal ratio), the combination of sawdust with date palm leaf wastes (in equal ratio), the combination of wheat straw with date palm leaf wastes (in equal ratio) as well as chemical supplements of urea (10g in liter per kg of substratebased on fresh weight of substrate), manganese sulfate (7μg. kg based on dry matter substrate), ammonium phosphate (15g in liter per kilogram of substrate, based on fresh weight of substrate) and bio additive supplements of mycorrhiza (one milliliter of Glomus mosseae inoculum per kg of salmon oyster mushroom spawn) and vermicompost (6% fresh weight of substrate) in the form of factorial experiment (two factors of substrate and supplement) based on a completely randomized design with three replications were used. The results showed that highest nitrogen content of adult fruit body was allocated to date palm leaf wastes substrate. Also, the amount of lovastatin in adult fruit body was in substratewheat straw enriched with manganese sulfate and substrate date palm leaf wastesenriched with mycorrhizal was recorded 600 and 219.22 mg.100g dry weights, respectively. Also, the results showed that the dry matter of oyster mushroom from third-flush in six substrates (combined and non-combined) was higher than the first and second-flush oyster mushroom. The highest (12.20 days) and the lowest (7.80 days) time to complete the vegetative growth of mycelium were allocated to non-combined substrates of date palm leaf wastes and wheat straw, respectively. The results of total yield showed that the highest (1499.00g) and lowest (904.88g) fruit body weight were allocated to wheat straw substrate and date palm leaf wastes substrate, respectively. Also, the highest (1312.00g) fresh weight of the adult fruit body (yield) is devoted to supplementation of manganese sulfate, and there was also a significant difference between this supplement with three other nutritional supplements in terms of yield at probability level of 5%. Therefore, the combination of wheat straw and manganese sulfate as a suitable substrate for the production of salmon oyster mushroom is recommended.