Comparison of the Effect of Different Microbial Agents on the Decomposition of Rice Straw

This study compared the decomposition effects of different microbial agents added to rice straw to screen for efficient and stable microbial agents and achieve effective utilization of rice straw resources. Different microbial agents can accelerate the decomposition of rice straw. The E4/E6 value of rice straw added with the <i>Bacillus subtilis</i> agent was significantly lower than that of rice straw added with other microbial agents on the 30th day. The lignin degradation rates for the <i>Bacillus subtilis</i> agent and <i>Trichoderma viride</i> agent treatments were higher than those of the other treatments from the 5th to 30th days. After adding the <i>Bacillus subtilis</i> agent for 30 days, the degradation rates of hemicellulose and cellulose in rice straw were higher than others, reaching 33.62% and 41.31%, respectively. Through principal component analysis and grey relational analysis, it was determined that the C/N ratio, organic carbon, E4/E6 value, conductivity value, and pH value are important evaluation indicators for the maturity promotion effect. Using the membership function analysis method, it was found that the <i>Bacillus subtilis</i> agent had the best overall performance in straw decomposition. This research provides a new viewpoint for the efficient utilization of straw resources.