Abstract
The purpose of this study was to investigate the suitability of different spent mushroom sawdust wastes (SMSWs) and different proportions of SMSWs as potential substrates for the cultivation of Auricularia polytricha by evaluating yield and biological efficiency of the fruiting body. Nine SMSWs were respectively utilized as the main ingredient in the cultivation of A. polytricha. Then, spent Pleurotus eryngii, Pleurotus cystidiosus, and Pleurotus ostreatus sawdust wastes were screened among these nine SMSWs to be utilized as substrate and to determine the suitable proportion of SMSW in the cultivation of A. polytricha based on their yields and biological efficiencies. The highest yield and biological efficiency (total of two flushes) of A. polytricha cultivation on a single SMSW substrate was obtained with spent P. eryngii sawdust waste, followed by spent P. cystidiosus and P. ostreatus sawdust wastes. These three SMSWs were then applied in nine combination substrates, which were screened based on yield and biological efficiency for cultivation of A. polytricha. The combination substrate with the highest yield and biological efficiency of A. polytricha cultivation was P. eryngii (PES) + P. cystidiosus spent sawdust (PCYS) (235.4 g/bag yield and 58.85% biological efficiency); its yield was 1.62 folds higher than that of the control. From the results, we found that it was feasible to use spent sawdust wastes of P. eryngii and P. cystidiosus to replace sawdust for cultivation of A. polytricha.
Highlights
The rapid worldwide growth in mushroom production has resulted in about 13.6 million metric tons/y of spent sawdust wastes [1]
Some spent sawdust wastes have been utilized as substrate for cultivation of mushrooms, such as mushroom sawdust wastes for cultivation of Pleurotus citrinopileatus [3]; P. ostreatus cultivated on Hypsizigus marmoreus spent mushroom substrate [4]; spent Pleurotus compost for production of Agrocybe cylindracea [5]; Pleurotus, Ganoderma, and Lentinula cultivated on spent oyster mushroom substrate [6]; the use of Pleurotus ostreatus and Pleurotus sajor-caju for the culture of Agaricus blazei [7]; spent Flammulina velutipes substrate as the main compost constituent for the cultivation of Agaricus bisporus [8]; and spent shiitake substrate for production of Pleurotus sajor-caju [9]
We demonstrated that the hot water extract from spent P. citrinopileatus sawdust could enhance the mycelial growth of some mushrooms, such as Antrodia camphorata, H. erinaceus, Lepista sordida, Phellinus linteus, P. citrinopileatus, P. eryngii, and P. ferulae [24], and that the hot water extract from spent P. eryngii sawdust could enhance the mycelial growth of Ganoderma lucidum, Hypsizigus marmoreus, Lentinula edodes, P. linteus, and P. sajor-caju [25]
Summary
The rapid worldwide growth in mushroom production has resulted in about 13.6 million metric tons/y of spent sawdust wastes [1]. Over 140,000 metric tons of fruiting bodies are produced every year, which bring over 300,000 metric tons of spent sawdust wastes in Taiwan [2]. The large amount of waste is an environmental problem, and development of technologies for its treatment or reuse is underway. Most of these spent sawdust wastes are used as organic fertilizer, some of sawdust wastes are left in the mushroom cultivation areas to be disposed of through decay. Some spent sawdust wastes have been utilized as substrate for cultivation of mushrooms, such as mushroom sawdust wastes for cultivation of Pleurotus citrinopileatus [3];. Spent mushroom sawdust wastes (SMSWs) could be a potential alternative substrate to cultivate other P. ostreatus cultivated on Hypsizigus marmoreus spent mushroom substrate [4]; spent Pleurotus compost for production of Agrocybe cylindracea [5]; Pleurotus, Ganoderma, and Lentinula cultivated on spent oyster mushroom substrate [6]; the use of Pleurotus ostreatus and Pleurotus sajor-caju for the culture of Agaricus blazei [7]; spent Flammulina velutipes substrate as the main compost constituent for the cultivation of Agaricus bisporus [8]; and spent shiitake substrate for production of Pleurotus sajor-caju [9].
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