High soil moisture rather than drying-rewetting cycles reduces the effectiveness of nitrification inhibitors in mitigating N2O emissions

• DOI: 10.1007/s00374-024-01811-2
• Publication Date: 2024-03-15T07:02:01Z
• Authors: Pablo Lacerda Rib...; Abhijeet Singh; Amit Sagervanshi; Asif Naeem; Karl Hermann Mühling
• Keywords: Nitrous oxide

Abstract Climate change has been intensifying soil drying and rewetting cycles, which can alter the microbiome structure activity. Here we hypothesized that a drying-rewetting cycle enhances biodegradation and, hence, decreases effectiveness of nitrification inhibitors (NIs). The DMPP (3,4-Dimethylpyrazole phosphate) MP + TZ (3-Methylpyrazol Triazol) was evaluated in 60-day incubation studies under relative to constant low high moisture conditions (40% 80% water-holding capacity, WHC, respectively) two different textured soils. measurements included (i) daily cumulative N 2 O-N emissions, (ii) NH 4 -N NO 3 − concentrations, (iii) composition bacterial communities. Application reduced overall emissions (-45%), as well 40% WHC (-39%) (-25%). retarded decreased release from sandy silt loam soils, while mitigated production only soil. Unexpectedly, between days 30 60, NI-treated soils increased by up fivefold No-NI treatment at WHC. Likewise, abundance studied nitrifying bacteria indicated NIs had short-term These results suggested might trigger fine-textured with after this inhibitory effect. In conclusion, effectively reduce rewetting.