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

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

doi:10.1007/s11270-021-05282-1

Yafei Guo, Ahmad Khan + Show 3 more

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https://doi.org/10.1007/s11270-021-05282-1

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Abstract

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.

Highlights

Carbon dioxide (CO2) and nitrous oxide (N2O) are the primary greenhouse gases (GHGs) present in the Earth’s atmosphere (IPCC, 2010). CO2 could hang around for a long time, between 300 and 1000 years, once it is added to the atmosphere (Alan, 2019)
3 Results 3.1 Rate of CO2‐C and N2O‐N Emissions In unamended soil, the rates of CO2-C and N2O-N emissions were substantially lower than the biogas residues amended soils and there was no consistent pattern of increase or decrease with the passage of time during the incubation period (Figs. 1 and 2)
Rates of both CO2-C and N2O-N emissions were substantially higher in biogas residue (BR)- and Acidified biogas residues (ABR)-amended soils than unamended soil, with BR application showing more increase than ABR application

Summary

Introduction

Carbon dioxide (CO2) and nitrous oxide (N2O) are the primary greenhouse gases (GHGs) present in the Earth’s atmosphere (IPCC, 2010). CO2 could hang around for a long time, between 300 and 1000 years, once it is added to the atmosphere (Alan, 2019). Carbon dioxide (CO2) and nitrous oxide (N2O) are the primary greenhouse gases (GHGs) present in the Earth’s atmosphere (IPCC, 2010). The lifetime of atmospheric CO2 concentration, with an increase of about 120 ppm over the past 250 years, has risen to a current global average of approximately 409 ppm, and future rapid increase is expected, with values likely to reach 550 ppm by mid-century and 1000 ppm by the end of this century (IPCC, 2014). N2O is a long-lived GHG, has a lifetime of 116 ± 9 years (Prather et al, 2015), and is a major stratospheric ozone-depleting substance (Thompson et al, 2019). In soils, N2O is produced as a by-product of nitrification and denitrification processes which are carried out by different types of microbes (Bremner, 1997). To meet the ambitious climate change adaptations, CO2 and N2O emissions should be minimized (IPPC, 2018)

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