EFFECT OF DIFFERENT AGRO-INDUSTRIAL WASTES ON YIELD AND QUALITY OF OYSTER MUSHROOM (Pleurotus ostreatus)

Abstract

The present study was conducted both at the laboratories of Horticulture, and Food Processing and Preservation, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during November, 2016 to April, 2017 to investigate the effects of five substrates on the productivity and quality of oyster mushroom (Pleurotus ostreatus). This single factor experiment was set with five treatments: rice straw (T1), wheat straw (T2), corncobs (T3), saw dust and rice husk @ 3:1 (T4) and sugarcane bagasses (T5). The maximum % of visual mycelium growth with the least duration to complete the mycelium running (100% and 15.0 days, respectively) was found in T5. The lowest visual mycelium % and the utmost days to complete the mycelium running (46.6% and 38.2 days, respectively) were observed in T4. In the 1st flush, the topmost number of primordia per packet was noted in T5 (487.8) and in the 2nd flush, the maximum was counted from T2 (170.4). T4 took minimum days (2.6) for stimulation to primordia initiation in the 1st flush whereas in the 2nd flash, T2 needed the minimum days (12.8). The minimum days (3.4) required in T2 for the primordia initiation to harvest in the 1st flush while in the 2nd flush in T1 took the minimum days (4.6). In both the flushes, the minimum days (8.0 and 20.60) were required in T2 for stimulation to harvest. In the 1st flush, both the highest number of fruiting body and effective number of fruiting body per packet was counted in T4 (24.20 and 21.20) whereas in the 2nd flush, the highest was recorded in T2 (24.80 and 12.20). In both the flush, the highest individual weight of the fruiting body was observed in T2 (5.39 and 4.59 g). In the 1st flush, the highest amount of fruiting body per packet (102.13 g) was harvested from T4 but in the 2nd flush, it was found from T2 (62.29 g). In the 1st flush, the highest length of the stalk (1.34 cm) of the fruiting body and the highest diameter and thickness of the cap (2.01 and 0.28 cm) were measured in T4 while the highest diameter of the stalk (0.41 cm) was from T2. The highest % of dry matter was accumulated in T1 (16.31) in the 1st flush. However, in the 2nd flush, it was recorded in T4 (13.53%). The topmost value of TSS (11.20) was recorded in T2 whereas the utmost amount of protein (6.87 mg/100 g of fw) and polyphenols (196.88 mg GAE/100 g of fw) were detected from T5 and T4, respectively. From the overall results, it was apparent that, the saw dust with the rice husk produced the highest amount of the fruiting body with the topmost polyphenols, moderate protein and TSS too.