In this study the agronomic viability of Pleurotus ostreatus (Jacq.) P. Kumm., is studied by reusing the spent substrates previously used in crops of the same mushrooms. After the physical and chemical characterization of the substrates, we have evaluated the qualitative production parameters in one growing season. As base material, the experiment was arranged with wheat straw (WS) and spent Pleurotus substrate (SPS) to generate prepared substrates, alone and mixed with different proportions of wheat bran (WB) and the commercial supplement Calprozime®. With the substrates supplemented with 300 g of WB + 120 g Calprozime®, we obtained generally higher ash (8.43%) and protein contents (24.75%) in the mushrooms. These substrates also achieved acceptable breaking strength values (Bs) (182.25 N) and compression energy (CE) (944.63 mJ) in the harvested mushrooms. In turn, these substrates promote lightness (60.31) and yellow‐blue (b*) (12.93) chromaticity of the harvested mushrooms. Consequently, these composts degraded by Pleurotus ostreatus formulations could be a low cost substrate, selective and balanced nutrient for the growth and development of the oyster mushrooms. Practical Applications Substrates supplemented with 300 g of wheat bran (WB) + 120 g Calprozime® could be integrated through new formulations and methodologies while lowering production costs and reducing the environmental impact of unusual waste. Spent Pleurotus substrate (SPS) is considered to be environmentally unfriendly, undesirable, and presents a solid waste disposal problem for mushroom growers. If SPS could be easily available at a low cost it could be integrated into new formulations and methodologies, diminish the environmental impact of the waste produced during mushroom cultivation, limit the grower's dependence on straw, and decrease the environmental impact of its overgrowing accumulation.

In this study, the agronomic viability of Pleurotus ostreatus (Jacq.: Fr.) P. Kumm. was studied by reusing spent substrates that were previously used for crops of this mushroom. After the physical and chemical characterization of the substrates, we evaluated the quantitative production parameters for one growing season. The experiment used wheat straw (WS) and spent Pleurotus substrate (SPS) as a base material to generate prepared substrates that could be reutilized for mushroom production. These base substrates were supplemented with wheat bran (WB) (two doses, 300 and 600 g/6 kg) and the commercial supplement Calprozime® (120 g/6 kg). We obtained a biological efficiency (BE) between 50 and 63%, a high quantity of mushrooms (between 26 and 39 mushrooms/bag) and an excellent unit weight of the fruiting bodies (between 24.34 and 39.54 g) with the substrates supplemented with a 120 g/6 kg dose of Calprozime®.

In this paper, the agronomic viability of Pleurotus ostreatus (Jacq.) P. Kumm. is studied by reusing the spent substrates previously used in crops of the same mushrooms. To this substrates are applied commercial nutritional supplements (Calprozime ® , Champfood ® and Promycel ® ), to research their potential use as additives together with wheat straw (WS), calcium sulphate and calcium carbonate at different doses. After the physical and chemical characterization of the substrates, we evaluated the qualitative production parameters in one flush. The mixture of wheat straw (WS) (3,000 g) and spent Pleurotus substrate (SPS) (3,000 g) supplemented with 120 g of each of the commercial supplements (Promycel ® , and Calprozime ® Champfood ® ) are substrates that promote red-green (a*) and yellow-blue (b*) chromaticity in harvested mushrooms. This manuscript presents the results obtained in an experiment where different supplements were used to enrich substrates composed of wheat straw and spent substrate. Qualitative features of Pleurotus ostreatus mushrooms were evaluated.

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.

In this article, the agronomic viability of reusing spent Pleurotus ostreatus substrates (SPS) previously used in a mushroom crop is studied using two commercial nutritional supplements at two different doses. After physical and chemical characterization of the substrates, we evaluated the quantitative production parameters in a single growing season. The best agronomic performance was observed with substrates supplemented with Calprozime 1 at doses of 20 and 10 g/kg, providing high values of biological efficiency (BE) at 41.8 and 35.0 g/100 kg substrate, respectively, much like the commercial substrate used as a control for most of the parameters considered. If SPS could be available at low cost, then it could be integrated into new formulations and methodologies, thus helping to diminish the environmental impact of the waste produced during mushroom cultivation as well as limiting the grower's dependence on straw and decreasing the environmental impact of its accumulation.

Description of the subject. In this work the agronomic viability of substrates based on spent Agaricus bisporus Imbach (Lange) substrates (SAS) and spent Pleurotus ostreatus (Jacq.) P. Kumm. substrates (SPS) is studied. Objectives. The aim of this work is the qualitative agronomic evaluation of SPS and SAS and the mixture of thereof in different proportions, such as lignocellulosic sources in new growing cycles of P. ostreatus. Method. In addition to the commercial substrate used as a control reference, six different treatments are considered. In this experiment, SPS and SAS were mixed in different amounts. SAS was subjected to a heat treatment in a growing room (“cook out”) and then to a maturation treatment which consisted of a controlled recomposting process in cameras. SPS was subjected to a pasteurizing heat treatment (60 °C – 65 °C, 8 h) and a progressive temperature decrease for at least 15 h to a “seeding” temperature (25 °C). Results. SPS (3,600 g) + SAS (2,400 g) and SPS (3,000 g) + SAS (3,000 g) were prepared substrates that achieved acceptable crude protein content in their fruiting bodies. Additionally, we obtained higher ash content, lightness, yellow-blue (y-b) and red-green (r-g) chromaticity, breaking strength (Bs), and compression energy (CE) in these mushrooms. These values were higher than the mean values, and even higher than the commercial substrate. Conclusions. Increased SAS participation in the mixture of the processed substrate (and the consequent reduction of SPS participation) resulted in mushrooms that require higher Bs, and CE. These formulation-based composts degraded by the growth of P. ostreatus, could be a low-cost substrate with selective and balanced nutrients for growth and development of oyster mushrooms.