Lysimeter-based full fertilizer 15N balances corroborate direct dinitrogen emission measurements using the 15N gas flow method. Yankelzon, I., Schilling, L., Butterbach-Bahl, K., Gasche, R., Han, J., Hartl, L., Kepp, J., Matson, A., Ostler, U., Scheer, C., Schneider, K., Tenspolde, A., Well, R., Wolf, B., Wrage-Moennig, N., & Dannenmann, M. Biology and Fertility of Soils, February, 2024.
Lysimeter-based full fertilizer 15N balances corroborate direct dinitrogen emission measurements using the 15N gas flow method [link]Paper  doi  abstract   bibtex   
Abstract The 15 N gas flux ( 15 NGF) method allows for direct in situ quantification of dinitrogen (N 2 ) emissions from soils, but a successful cross-comparison with another method is missing. The objectives of this study were to quantify N 2 emissions of a wheat rotation using the 15 NGF method, to compare these N 2 emissions with those obtained from a lysimeter-based 15 N fertilizer mass balance approach, and to contextualize N 2 emissions with 15 N enrichment of N 2 in soil air. For four sampling periods, fertilizer-derived N 2 losses ( 15 NGF method) were similar to unaccounted fertilizer N fates as obtained from the 15 N mass balance approach. Total N 2 emissions ( 15 NGF method) amounted to 21 ± 3 kg N ha − 1 , with 13 ± 2 kg N ha − 1 (7.5% of applied fertilizer N) originating from fertilizer. In comparison, the 15 N mass balance approach overall indicated fertilizer-derived N 2 emissions of 11%, equivalent to 18 ± 13 kg N ha − 1 . Nitrous oxide (N 2 O) emissions were small (0.15���± 0.01 kg N ha − 1 or 0.1% of fertilizer N), resulting in a large mean N 2 :(N 2 O + N 2 ) ratio of 0.94 ± 0.06. Due to the applied drip fertigation, ammonia emissions accounted for \textless 1% of fertilizer-N, while N leaching was negligible. The temporal variability of N 2 emissions was well explained by the δ 15 N 2 in soil air down to 50 cm depth. We conclude the 15 NGF method provides realistic estimates of field N 2 emissions and should be more widely used to better understand soil N 2 losses. Moreover, combining soil air δ 15 N 2 measurements with diffusion modeling might be an alternative approach for constraining soil N 2 emissions.
@article{yankelzon_lysimeter-based_2024,
	title = {Lysimeter-based full fertilizer {15N} balances corroborate direct dinitrogen emission measurements using the {15N} gas flow method},
	issn = {0178-2762, 1432-0789},
	url = {https://link.springer.com/10.1007/s00374-024-01801-4},
	doi = {10.1007/s00374-024-01801-4},
	abstract = {Abstract
            
              The
              15
              N gas flux (
              15
              NGF) method allows for direct in situ quantification of dinitrogen (N
              2
              ) emissions from soils, but a successful cross-comparison with another method is missing. The objectives of this study were to quantify N
              2
              emissions of a wheat rotation using the
              15
              NGF method, to compare these N
              2
              emissions with those obtained from a lysimeter-based
              15
              N fertilizer mass balance approach, and to contextualize N
              2
              emissions with
              15
              N enrichment of N
              2
              in soil air. For four sampling periods, fertilizer-derived N
              2
              losses (
              15
              NGF method) were similar to unaccounted fertilizer N fates as obtained from the
              15
              N mass balance approach. Total N
              2
              emissions (
              15
              NGF method) amounted to 21 ± 3 kg N ha
              − 1
              , with 13 ± 2 kg N ha
              − 1
              (7.5\% of applied fertilizer N) originating from fertilizer. In comparison, the
              15
              N mass balance approach overall indicated fertilizer-derived N
              2
              emissions of 11\%, equivalent to 18 ± 13 kg N ha
              − 1
              . Nitrous oxide (N
              2
              O) emissions were small (0.15���± 0.01 kg N ha
              − 1
              or 0.1\% of fertilizer N), resulting in a large mean N
              2
              :(N
              2
              O + N
              2
              ) ratio of 0.94 ± 0.06. Due to the applied drip fertigation, ammonia emissions accounted for {\textless} 1\% of fertilizer-N, while N leaching was negligible. The temporal variability of N
              2
              emissions was well explained by the δ
              15
              N
              2
              in soil air down to 50 cm depth. We conclude the
              15
              NGF method provides realistic estimates of field N
              2
              emissions and should be more widely used to better understand soil N
              2
              losses. Moreover, combining soil air δ
              15
              N
              2
              measurements with diffusion modeling might be an alternative approach for constraining soil N
              2
              emissions.},
	language = {en},
	urldate = {2024-11-26},
	journal = {Biology and Fertility of Soils},
	author = {Yankelzon, Irina and Schilling, Lexie and Butterbach-Bahl, Klaus and Gasche, Rainer and Han, Jincheng and Hartl, Lorenz and Kepp, Julia and Matson, Amanda and Ostler, Ulrike and Scheer, Clemens and Schneider, Katrin and Tenspolde, Arne and Well, Reinhard and Wolf, Benjamin and Wrage-Moennig, Nicole and Dannenmann, Michael},
	month = feb,
	year = {2024},
}
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