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| The impact of lactic acid bacteria on gas emissions during the storage of slurry and applications |
| Received:January 09, 2025 |
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| KeyWord:animal slurry;ammonia;mitigation;lactic acid bacteria;maize |
| Author Name | Affiliation | E-mail | | LIU Yujie | Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050022, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHAO Huicheng | Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050022, China | | | LI Meihua | Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050022, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHANG Linqi | Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050022, China | lqzhang@ms.sjziam.ac.cn |
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| Abstract: |
| This study investigated the effects of lactic acid bacteria（LAB）addition on NH3, CO2, and N2O emissions during slurry storage and evaluated the resource utilization potential of the treated slurry. The experiment included two groups：a LAB-treated slurry group（FS, sealed storage after LAB addition）and a fresh slurry control group（FD, sealed storage only）. The emission characteristics of NH3, CO2, and N2O were compared over an 11-day storage period. After storage, both slurries were used as fertilizers（denoted as FSP and FDP, respectively）, and their effects on maize growth parameters（root length, plant height, total fresh weight, aboveground fresh weight, underground fresh weight, aboveground dry weight, underground dry weight, and root-to-shoot ratio）were analyzed. The results showed that the FS group achieved significant NH3 reduction, with a cumulative emission of 2.5 g·L-1 over 11 days, representing a 26.5% reduction compared to the FD group（3.4 g · L-1）. The maximum daily NH3 reduction rate reached 35%（P<0.05）. No significant differences were observed in CO2 and N2O emissions between the two groups, and N2O emissions were negligible. By the end of storage, the pH of the FS group decreased by 0.81 pH unit, while the total ammonia nitrogen content increased by 23.9%, indicating that pH reduction was the primary cause of NH3 mitigation. Furthermore, maize growth in the FSP group was significantly better than in the FDP group, with increases of 36.5% in root length, 25.7% in plant height, 59.0% in aboveground fresh weight, 22.4% in underground fresh weight, 68.4% in aboveground dry weight, and 45.6% in total fresh weight（P<0.05）. In conclusion, LAB treatment of slurry significantly reduces NH3 emissions during storage without increasing greenhouse gas emissions and promotes crop growth. This method offers advantages such as high safety, low cost, and environmental friendliness, demonstrating strong potential for practical application. |
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