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| Effects of Different Microbial Inoculants on Aerobic Composting of Corn Stalk |
| FENG Zhi，LI Jie，ZHANG Guo-bin，LI Wei-lin，JIA Hao-yu，LIU Zhao-fa n，YU Ji-hua* |
| College of Agronomy， Gansu Agricultural University， Lanzhou 730070， Gansu， China |
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Abstract This study was committed to screen out the suitable corn stalk single fermentation microbial inoculants on the northwest desert region of non-cultivated land in an aerobic composting test．Three representative microbial inoculants（ microbial inoculant 1 is mainly consisted of cellulose fungus and degraded starch bacillus；microbial inoculant 2 is mainly consisted of Bacillus subtilis，Streptomyces tendae，Streptomyces albogriseolus，Aspergillus niger and Trichoderma reesei；microbial inoculant 3 is mainly consisted of dozens microorganisms and bio-enzyme） were selected to do the compost experiment on corn stalk，not adding inoculants for the control check. The stacking temperature，moisture content，pH，germination seed index and other factors were surveyed and analyzed during the composting. The results show that adding microbial inoculants can effectively speed up the fermentation.
The effects are better than that without addition．The temperatures of adding microbial inoculant 1 and microbial inoculant 3 treatments are relatively higher，which rose to 55 °C after 2 days．High temperature lasted for 27 and 33 days，respectively．In the microbial inoculant 2 treatment，high temperature had short duration．The seed germination index was over 80% after 30 d，when treated by microbial inoculant 1 and microbial inoculant 3，while the CK needed 40 d．The total organic carbon contents of various treatments showed a downward trend，when fermentation was implemented. Treatment of microbial inoculant 3 had the fastest speed for organic carbon degradation．The pH values of all treatments were within the scope suitable for matured compost．We can summarize that the effect of microbial inoculant 3 is the best，microbial inoculant 1 is second and micro bial inoculant 2 is worst．
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Received: 07 March 2013
Published: 21 March 2013
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