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Sammanfattning

Soil pH, moisture, and nitrogen (N) rate may affect the effectiveness of the nitrification inhibitor 3,4-Dimethyl-pyrazole phosphate (DMPP) in mitigating N2O release. Thus, the present study raised the question: do soil pH and N rate regulate the effect of DMPP on mitigating N2O production and promoting N2O reduction to N2 from soils subjected to temporary waterlogging? This was studied in a greenhouse experiment under semi-controlled conditions in which wheat was cultivated under aerobic conditions for 30 days, followed by a temporary waterlogging period of 5 days. The study investigated the factors of soil pH, which was manipulated by liming (unlimed and limed), application of the nitrification inhibitor DMPP, and N application rate (60 and 180 mg N kg soil-1), referred to as N60 and N180. The N source was ammonium sulfate. DMPP reduced the relative abundance of nitrifying bacteria such as Nitrospira and Nitrosospira and, therefore, suppressed nitrification in all treatments. After waterlogging, DMPP efficiently mitigated N2O-N release from unlimed soil (80 %), probably by suppressing fungal (Cladosporium, Chaetomium, and Fusarium) and bacterial (Bradyrhizobium) denitrifiers due to DMPP-induced lower NO3-concentrations. In addition, DMPP reduced cumulative N2O-N release by 94 % at the N180 rate but was ineffective at the N60 rate in the limed soil. In conclusion, DMPP was confirmed as an excellent mitigation measure for N2O release from unlimed soils subjected to waterlogging. However, our study demonstrated that relatively low N rates can lead to DMPP ineffectiveness in reducing N2O release from limed soil subjected to temporary waterlogging.

Nyckelord

Nitrification; Denitrification; Nitrification inhibitor; Nitrous oxide; Liming; Soil moisture

Publicerad i

Applied Soil Ecology
2025, volym: 213, artikelnummer: 106287
Utgivare: ELSEVIER

SLU författare

UKÄ forskningsämne

Markvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.apsoil.2025.106287

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/143042