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Impact of different chloride salts and their concentrations on nitrification and trace gas emissions from a sandy soil under a controlled environment

Guo, Yafei
Becker‐Fazekas, Stefan
Mühling, Karl H.ORCIDiD
DOI: https://doi.org/10.23689/fidgeo-4287
Guo, Yafei; Becker‐Fazekas, Stefan; Mühling, Karl H., 2021: Impact of different chloride salts and their concentrations on nitrification and trace gas emissions from a sandy soil under a controlled environment. In: Soil Use and Management: n/a - n/a, DOI: 10.23689/fidgeo-4287.
 
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  • Abstract
Potassium chloride (KCl) and magnesium chloride (MgCl2) can be used to reduce carbon dioxide (CO2) and nitrous oxide (N2O) emissions, but their efficacy can be strongly affected by their Cl− concentration. This study aimed to compare the behaviour of different Cl− salts and concentrations with that of a typical commercial nitrification inhibitor (3, 4‐dimethylpyrazole phosphate, PIADIN). KCl, MgCl2 and PIADIN were investigated under a laboratory incubation experiment for two months. KCl and MgCl2 were applied at 0.5 and 1.0 g kg−1, while PIADIN was applied at 25 mg kg−1 soil. CO2 and N2O concentrations were analysed during the incubation period. The NH4+ and NO3‐ dynamics in soil were also measured. The results showed 0.5 and 1.0 g kg−1 KCl and 0.5 g kg−1 MgCl2 decreased CO2‐C emissions by 43%–46% and increased N2O‐N emissions by 15%–48%, whereas 1.0 g kg−1 MgCl2 decreased CO2‐C emissions by 72% and N2O‐N emissions by 19%. KCl and MgCl2 retarded the decrease of the NH4+‐N concentration and increase of the NO3‐‐N concentration. PIADIN reduced the emissions of CO2‐C by 113% and N2O‐N by 97% and maintained a high soil NH4+‐N concentration and low NO3‐‐N concentration. MgCl2 addition at 1.0 g kg−1 was an effective treatment as the Mg both fertilized the soil and inhibited CO2‐C and N2O‐N emissions. Moreover, 1.0 g kg−1 MgCl2 could retard soil nitrification, the decrease of NH4+‐N concentration and the increase of NO3‐‐N concentration. While PIADIN had no fertilizing value, it was a more effective nitrification inhibitor than Cl− salts.
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  • Geochemie, Mineralogie, Petrologie [350]
Subjects:
KCl
MgCl2
N2O emissions
nitrification
nitrification inhibitor
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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