EGU2020-388
https://doi.org/10.5194/egusphere-egu2020-388
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

N2O emission and governing factors on arable fields

Márton Dencső, Szandra Baklanov, Ágota Horel, Györgyi Gelybó, and Eszter Tóth
Márton Dencső et al.
  • Institute for Soil Sciences and Agricultural Chemistry, Centre for Agricultural Research Budapest, Hungary (dencso.marton@agrar.mta.hu)

This study focuses on the soil N2O emission of arable fields. We initially set up several soil column experiments in laboratory and based on these findings we started field measurements in a long term tillage experiment at Józsefmajor Experimental and Training Farm, Hungary. For the column experiments we collected undisturbed soil columns (d=10 cm, h=10 cm) from mouldboard ploughing (P) and no-till (NT) treatments.  We investigated the effect of different fertilizer doses (40, 80, 160, 240 kg h-1 N), soil water content (SWC) and different tillage methods on soil N2O emission.

We found a nonlinear response of N2O emission on the applied fertilizer doses. The moderately fertilized (80-160 kg ha-1 N) samples had the highest N2O emissions. Samples from NT had higher N2O emission than samples from P. We found better correlation between N2O emission and SWC in NT (R2 is between 0.47 and 0.62) than in the P (R2 is between 0.01 and 0.35).  The N2O emission values showed high spatial variability. The field measurements showed similar findings of N2O emission compared to the column experiments. In 2020 we intend to continue the field measurements and include further investigations of governing factors of soil N2O emission.

How to cite: Dencső, M., Baklanov, S., Horel, Á., Gelybó, G., and Tóth, E.: N2O emission and governing factors on arable fields, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-388, https://doi.org/10.5194/egusphere-egu2020-388, 2019

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