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Feasibility of Improved Iron Slag Containing Electron Acceptor to Mitigate Methane Emission
Snowie Jane C. Galgo,Hyeon Ji Song,Ronley C. Canatoy,Jisu Ha,Hogyeong Chae,Ji Yeon Lim,Jeong Gu Lee,Pil Joo Kim 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Mitigation strategies and practices have been studied to find stable solutions to alleviate agricultural-related methane (CH₄) emissions. The application of amendments containing electron acceptors, such as slag-based silicon fertilizer (silicate fertilizer), was newly found feasible due to its function to increase rice productivity and improve soil properties. Silicate fertilizer (SF) also contains electron acceptors (Fe and Mn) that control methanogens activity by limiting substrate availability, thus decreases CH₄ production. We hypothesized that SF could be improved as a CH₄ suppressor by increasing the contents of active Fe and Mn. We tested four iron and steel byproducts that contain electron acceptors; KR (Kambara reactor slag), FeMn (Ferromanganese slag), BOF (Basic oxygen slag), and Fe₂O₃ (Ferric oxide), in an incubation test to select a prospective byproduct and formulate the optimum mixing ratio with silicate fertilizer. Further, a field test was done to investigate the feasibility of the newly improved silicate fertilizer. We found that, among the byproducts, Fe₂O₃ was the most effective in suppressing CH₄ emission by 66% over the control (no amendment). Then, different mixing ratios (1%, 3%, and 5%) of Fe₂O₃ were mixed with silicate fertilizer, and a reduction of 40%, 62%, and 52% of CH₄ emission was noted after 30 days of incubation. Similar results were found out in the field test, in which the total CH₄ fluxes from the control plots were decreased by (20%) with silicate fertilizer amendment. Moreover, the application of the newly improved silicate fertilizers suppressed CH₄ emission by approximately (30%) over the control. Also, rice productivity increased with improved silicate fertilizer amendment by 38-39%, and as a result, the CH₄ flux intensity (kg CH₄ kg<SUP>-1</SUP> grain) was decreased around 57% over the control. In conclusion, the newly improved SF with more contents of Fe is feasible as soil amendment in mitigating CH₄ emission and increase rice productivity.