| Summary: | 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 <i>Auricularia polytricha</i> by evaluating yield and biological efficiency of the fruiting body. Nine SMSWs were respectively utilized as the main ingredient in the cultivation of <i>A. polytricha</i>. Then, spent <i>Pleurotus eryngii</i>, <i>Pleurotus cystidiosus</i>, and <i>Pleurotus ostreatus</i> 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 <i>A. polytricha</i> based on their yields and biological efficiencies. The highest yield and biological efficiency (total of two flushes) of <i>A. polytricha</i> cultivation on a single SMSW substrate was obtained with spent <i>P. eryngii</i> sawdust waste, followed by spent <i>P. cystidiosus</i> and <i>P. ostreatus</i> sawdust wastes. These three SMSWs were then applied in nine combination substrates, which were screened based on yield and biological efficiency for cultivation of <i>A. polytricha</i>. The combination substrate with the highest yield and biological efficiency of <i>A. polytricha</i> cultivation was <i>P. eryngii</i> (PES) + <i>P. cystidiosus</i> 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 <i>P. eryngii</i> and <i>P. cystidiosus</i> to replace sawdust for cultivation of <i>A. polytricha</i>.
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