8-1-3 Akther et al - EFFECT OF STEAM PASTEURIZATION OF SUBSTRATE ON GROWTH AND YIELD CONTRIBUTING CHARACTERS OF OYSTER MUSHROOM (PLEUROTUS OSTREATUS)

EFFECT OF STEAM PASTEURIZATION OF SUBSTRATE ON GROWTH AND YIELD CONTRIBUTING CHARACTERS OF OYSTER MUSHROOM (PLEUROTUS OSTREATUS)


Authors: K. Akhter* and M. Salahuddin M. Chowdhury
*Corresponding author: khadijaakhter@ymail.com

Abstract

 The experiment was conducted to study the effect of the varying periods of steam pasteurization (2, 3, 4 and 5 hours plus pasteurization in autoclave) along with without pasturization. of substrate on the growth and yield characters of oyster (Pleurotus ostreatus) mushroom at Sher-e-Bangla Agricultural University Mushroom Culture House, during January, 2015 to April, 2015. The growth and yield contributing characters of mushroom were significantly influenced by time duration of pasteurization of substrate. Minimum mycelium running time (7.0 days) was required in autoclaved spawn packets. The highest growth rate (0.96 cm/day) was observed in 3 hours steam treated packets which was statistically similar to autoclaved packets, the lowest time (3 days)  required for primordia  formation, the minimum days (5 days) required for primordia formation to first harvesting, the highest number of primordia was observed in three (3) hours steam pasteurized packets of mushroom. The maximum duration was required (46 days) for total harvesting after stimulation in autoclave sterilized packets. Significantly the highest number of fruiting bodies (49.40) per packet was harvested from five hours steam pasteurized packets. The highest diameter (8.16 cm) of pelius was observed in steam from 3 hours packets and the lowest average length (1.82 cm) of stipe was recorded in autoclaved packets. On the other hand, maximum time (29.00 days) was required for completion of mycelium running, the lowest mycelium run rate (0.36 cm), the highest days required from stimulation to primordia initiation (10.00 days), the lowest number of primordia (23.60), the lowest  number of fruiting bodies (20.40) were observed in unpasteurized packets (control). Steam pasteurization for three hours as well as sterilization of substrate by autoclave gave the better performance among the treatments.

Key word:  Oyster mushroom, steam pasteurization, substrate, growth attributes, yield attributes


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