Articles | Volume 16, issue 14
https://doi.org/10.5194/bg-16-2795-2019
https://doi.org/10.5194/bg-16-2795-2019
Reviews and syntheses
 | 
17 Jul 2019
Reviews and syntheses |  | 17 Jul 2019

Reviews and syntheses: Review of causes and sources of N2O emissions and NO3 leaching from organic arable crop rotations

Sissel Hansen, Randi Berland Frøseth, Maria Stenberg, Jarosław Stalenga, Jørgen E. Olesen, Maike Krauss, Paweł Radzikowski, Jordi Doltra, Shahid Nadeem, Torfinn Torp, Valentini Pappa, and Christine A. Watson

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Cited articles

Aguilera, E., Lassaletta, L., Gattinger, A., and Gimeno, B. S.: Managing soil carbon for climate change mitigation and adaptation in Mediterranean cropping systems: A meta-analysis, Agr. Ecosyst. Environ., 168, 25–36, https://doi.org/10.1016/j.agee.2013.02.003, 2013. 
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Anderson, T.-H. and Domsch, K. H.: Ratios of microbial biomass carbon to total organic carbon in arable soils, Soil Biol. Biochem., 21, 471–479, https://doi.org/10.1016/0038-0717(89)90117-X, 1989. 
Aronsson, H., Torstensson, G., and Bergstrom, L.: Leaching and crop uptake of N, P and K from organic and conventional cropping systems on a clay soil, Soil Use Manage., 23, 71–81, 2007. 
Askegaard, M., Olesen, J. E., and Kristensen, K.: Nitrate leaching from organic arable crop rotations: effects of location, manure and catch crop, Soil Use Manage., 21, 181–188, 2005. 
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Short summary
We discuss nitrous oxide (N2O) emissions and nitrate leaching in organic arable farming, and potential mitigation strategies. The losses are low under growing crops, but crop residues may induce larger losses. The correlation between yearly total N-input and N2O emissions is weak. Cover crops, except sole legumes, have the potential to reduce nitrate leaching but may enhance N2O emissions. Optimised synchrony of mineralisation with crop N uptake will enhance crop productivity and reduce losses.
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