Pleurotus sajor-caju (grey oyster mushroom) is a typical edible fleshy fungi. It has fruiting bodies shape like an oyster that contain high nutrient such as carbohydrates, proteins, fats, minerals and multivitamins. Due to its high nutritional values, the demand of grey oyster mushrooms keeps increasing. In this study, the effect of different durations and intervals of acoustic sound treatment on growth morphology, yield enhancement and the quality of the mushroom were studied. Using sound of fire cracker at constant intensity of 75 dB, four different acoustic sound treatments had been applied on the mushroom bags which were 5 pops at 5-day interval, 15 pops at 5-day interval, 5 pops at 10-day interval and 15 pops at 10-day interval and mushroom bags without any sound treatment acted as control. The results showed that the controls had longer time for mycellium to fill-up the bags compared to sound treated bags. Besides, controls also showed lower yield in terms of number of fruiting bodies and biological efficiencies (%) compared to all acoustic sound treated bags. However, 15 pops at 10-day interval had the shortest time taken to complete all the growth stages (mycellium growth, emergence of pinhead and formation of fruiting bodies). For colour of the mushroom, there were significant differences (P<0.05) in L* values for 15 pops at 5-day interval and no significant different (P>0.05) was observed for a* (redness) and b* (yellowness) values. Controls had the highest firmness value compared to mushroom with sound treatment. In summary, 15 pops at 10-day interval was the best treatment duration and interval as it took the shortest time for different growth stages with the greatest yield of mushrooms.
Sound stimulation and substrate are among the main factors that enhance the formation of fruiting bodies in order to increase the productivity of grey oyster mushroom. The main purpose of this study is to investigate the effects of ultrasonic and acoustics sound treatments on grey oyster mushroom (Pleurotus Sajor-caju) cultivated on rubber tree sawdust and kenaf waste. The growth performance, yield and post-harvest quality of grey oyster mushroom were determined. Mushroom bags were treated with ultrasonic and acoustic sound every 5 days intervals during mycelia growth. Sound treated mushroom bags had faster growth rate and treatment with acoustic sound appeared to be a better treatment among all the treatments. In terms of yield, sawdust obtained a relatively higher amount of total weight of fruiting bodies, greater biological efficiency and bigger number of fruiting bodies than kenaf waste. Acoustic sound contributed to a higher in yield but has the highest substrate utilization among all treatments. Sawdust shows no significant different (p>0.05) in physical characteristics such as pileus diameter compared to kenaf waste but both of them showed significant different (p<0.05) among different treatments. Acoustic sound had firmer and showed relatively darker compared to other treatments. Substrate of sawdust had a relatively higher of moisture content of pileus and stem than kenaf waste. Among all the treatments used, mushroom bag treated with acoustic and cultivated on sawdust was the best treatment due to is relatively faster growth performance and higher yield.
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