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N2O emissions from a loamy soil cropped with winter wheat as affected by N-fertilizer amount and nitrification inhibitor

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Abstract

Nitrogen (N) fertilization leads to the release of reactive N species, which can be detrimental to the environment. Nitrification inhibitors (NIs) are substances capable of retarding the oxidation of ammonium to nitrate, which can increase N use efficiency of applied N fertilizer and decrease N losses such as the release of the greenhouse gas nitrous oxide (N2O). Adaption of N fertilizer amount to plant demand might also decrease N surpluses and thus lower N2O emissions. We investigated the effects of N fertilizer amount (0, 120, 180, and 240 kg N ha−1 a−1) and the use of the NI 3,4-dimethylpyrazol phosphate, DMPP, on annual N2O emission from a soil cropped with winter wheat in a 2 year field experiment. N2O fluxes were affected by N level and by use of DMPP with higher fluxes under high N amounts and treatments without NI. Application of DMPP led to a reduction of annual emissions by 45%. Interestingly, also winter emissions (8–12 months after N fertilization) were decreased by DMPP. In this period, a complete degradation of DMPP was assumed. The reason for this effect remains unclear. Wheat yield and quality were unaffected by DMPP, whereas grain yield was increased with N fertilizer amount in the first year. Nevertheless, response curves of grain yield-related N2O emissions over all data showed lower optimal N fertilizer doses when DMPP was used. Application of DMPP at suboptimal N rates could help to achieve a better profitability with simultaneous reduction of the product scaled emission.

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Acknowledgments

We thank all the helpers and technical assistances, especially Hinrich Bremer for the measuring of Nmin samples and Hans Bucher and Heidi Zimmermann for managing the field experiment. The authors would also like to thank Prof. Hans-Peter Piepho for helping us to improve the statistical analysis of the study.

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Correspondence to Ivan Guzman-Bustamante.

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Guzman-Bustamante, I., Winkler, T., Schulz, R. et al. N2O emissions from a loamy soil cropped with winter wheat as affected by N-fertilizer amount and nitrification inhibitor. Nutr Cycl Agroecosyst 114, 173–191 (2019). https://doi.org/10.1007/s10705-019-10000-9

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  • DOI: https://doi.org/10.1007/s10705-019-10000-9

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