Abstract
The use of emission factors (EF) for ammonia (NH3) after fertilizer application is a central tool for nitrogen management. Ammonia loss measurements after application of urea fertilizer at three research sites in Germany indicated that emissions deviated from European standard EFs. Scenario modelling of emissions based on long term weather data and variable application dates could provide a robust basis for the derivation of EFs. Two model approaches were used to test this approach for urea applied to winter wheat. The two model approaches comprised the dynamic model Volt’Air’ and a statistical model. Scenario calculations were run for 15 years and 4 application dates in each year for the 3 sites. The empirical model performed better at predicting cumulative losses. Both models simulated more than half of relative NH3 emissions (% urea N applied) in a range of 0–10%. The average and median EFs by both models over all application dates were 10.2 and 8.1%, respectively, and were substantially lower than the current European EFs for urea (15–16%). The lowest median and mean EFs were observed at beginning of the vegetation period with 4.3/4.8 and 7.2/6.7% applied N for empirical and Volt’Air model, respectively, and highest at wheat anthesis (15/17.4 and 11/10.2%). Scenario modelling can be considered as a tool for the derivation of robust and representative EFs for NH3 emissions not only for urea but also other emitting fertilizer sources. A much more expanded data set is needed and both model approaches require further development to reach this aim.
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12 October 2017
The captions of figures 3–6 in the original publication are misplaced. The correct figure captions are as follows.
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Acknowledgements
The study was funded by SKW Piesteritz, Germany. We are grateful to Matthew Carabott for revision of use of English language.
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The original version of this article was revised. The caption of figures 3–6 was misplaced. The correct figure captions is updated in the article.
A correction to this article is available online at https://doi.org/10.1007/s10705-017-9890-6.
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Pacholski, A., Doehler, J., Schmidhalter, U. et al. Scenario modeling of ammonia emissions from surface applied urea under temperate conditions: application effects and model comparison. Nutr Cycl Agroecosyst 110, 177–193 (2018). https://doi.org/10.1007/s10705-017-9883-5
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DOI: https://doi.org/10.1007/s10705-017-9883-5