Preparation of microbial decomposition compound bacterial agent and its composting performance of spent mushroom substrate

Abstract

In order to better rot mushroom residue and improve the content of available phosphorus and humus in compost, a high cellulose degrading strain YD4 was selected from the waste mushroom residue. The cellulose degrading bacterium Trichoderma reevi DGW1, rhizosphere promoting bacterium Bacillus subtilis SL-44 and Pseudomonas Rs-198 were used to compound five kinds of microbial agent combination:SL-44+Rs-198+YD4, SL-44+Rs-198+DGW1、Rs-198+DGW1+YD4、SL-44+DGW1+YD4、SL-44+Rs-198+YD4+DGW1. Different combinations of bacteria were inoculated with 2% volume fraction and the mushroom residue compost was carried out. The results show that:Compared with the control group, 30 days after composting, the composting treatment inoculated SL-44+Rs-198+YD4+ DGW1 entered the rot stage as soon as 13 days, the lowest electrical conductivity of the pile was 1.37 mS·cm-1, and the lowest optical density ratio (E4/E6) of humic acid to fulvic acid was 6.11. The content of available phosphorus and the maximum degradation rate of organic matter are higher. Inoculant SL-44+Rs-198+YD4+ DGW1 promoted the formation of humus and improved the maturity and stability of compost.

Keywords

• spent mushroom substrate compost
• available phosphorus content
• process of humification
• compound microbial agent
• cellulose degradation