Effect of olive pruning residues on substrate temperature and production of oyster mushroom (Pleurotus ostreatus)

Abandoned olive pruning residues (OLPR) are good source of carbon, an element required for the growth of Pleurotus ostreatus mushroom.
The current study investigated the effect of implementation of olive pruning residues in oyster mushroom substrate.
Based on mixtures of wheat straw (WS) (commercial control) and OLPR, four substrate types (treatments) were tested T1: WS (control); T2: OLPR; T3: WS:OLPR 1:3, and T4: WS:OLPR 3:1. Results showed that the use of OLPR in high proportions or alone caused an increase in substrates’ temperature.
Moreover, the use of WS:OLPR 1:3 substrate reduced the durations between spawn run initiation (SRI) and 50% mycelial colonization (50% MC) and between 100% MC and pin head formation (PNF), while WS:OLPR 3:1 substrate showed an extended duration between the last mentioned predictors.
Organic matter loss (OML) was significantly higher in T1 compared to T3 and T4 (76.7, 55.1 and 63.4%, respectively). Biological efficiency (BE) was 105.0, 54.1 and 80.3% in T1, T3 and T4, respectively.
Increasing proportions of OLPR in tested substrates caused a reduction in organic matter loss (OML) and BE. The OML was strongly correlated (R²≥0.9) with the duration between complete mycelial colonization (100% MC) and pinhead formation (PNF), and that between PNF and first harvest (HF1). The substrates’ temperature between 100% MC and HF1 had a positive influence on BE and economic yield (EY), and the duration between PNF and HF1 had the strongest negative correlation to EY. Substrates’ contents of linolenic acid, arachidic acid, and fat were strongly correlated with the time to PNF and HF1, while total protein content affected only the stage PNF. In conclusion, OLPR could partially substitute wheat straw substrate for the production of P. ostreatus. Low OLPR proportions in the substrate reduced the duration of mushroom growth cycle, while high OLPR proportions allowed producing the yields, which were comparable with commercial control.

IV International Symposium on Horticulture in Europe – SHE2021

S. Abou Fayssal, M.A. Alsanad, M.H. Yordanova, Z. El Sebaaly, R. Najjar, Y.N. Sassine

substrate temperature, agricultural wastes, organic matter loss, yield, supplement

https://doi.org/10.17660/ActaHortic.2021.1327.32