Comparative Effectiveness of Biogas Residue Acidification and Nitrification Inhibitors in Mitigating CO2 and N2O Emissions from Biogas Residue-Amended Soils

Guo, Yafei; Anjum, Anjum; Khan, Ahmad; Naeem, Asif; Mühling, Karl H.

Comparative Effectiveness of Biogas Residue Acidification and Nitrification Inhibitors in Mitigating CO2 and N2O Emissions from Biogas Residue-Amended Soils

2021

Guo, Yafei | Anjum, Anjum | Khan, Ahmad | Naeem, Asif | Mühling, Karl H.

Owing to their high carbon and nitrogen contents, biogas residues may lead to higher carbon dioxide (CO₂) and nitrous oxide (N₂O) emissions from soils. Acidification of biogas slurry and application of nitrification inhibitors (NIs) could mitigate the emission of these gases. An incubation experiment was therefore carried out to investigate the effect of NIs, DMPP (3, 4-dimethylpyrazole phosphate), and PIADIN (active ingredients: 3.00–3.25% 1,2,4-triazole and 1.50–1.65% 3-methylpyrazole), on CO₂ and N₂O emissions from soils fertilized with biogas residues and acidified biogas residues. Biogas residues produced higher ammonium-nitrogen (NH₄⁺-N) and nitrate-nitrogen (NO₃⁻-N) concentrations in soils which resulted in higher emissions of CO₂-C and N₂O-N than that from acidified biogas residues. Both DMPP and PIADIN significantly decreased the emissions of CO₂-C (8.1–55.8%) and N₂O-N (87–98%) and maintained lower NH₄⁺-N and NO₃⁻-N concentrations when compared to control (without nitrification inhibitors). However, the DMPP had a higher reduction capability for CO₂-C emissions than PIADIN in acidified biogas residue applied soil. In conclusion, the acidification of biogas residues and application of NIs are effect in reducing gaseous emission from biogas residue fertilized soils and thus could improve the fertilizer effectiveness of the residues.

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