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Impacts of slurry acidification and injection on fertilizer nitrogen fates in grassland

Schreiber, Mirella 1; Bazaios, Elpida 1; Ströbel, Barbara 1; Wolf, Benjamin 1; Ostler, Ulrike 1; Gasche, Rainer 1; Schlingmann, Marcus; Kiese, Ralf ORCID iD icon 1; Dannenmann, Michael 1
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)

Abstract:

Low nitrogen (N) use efficiency of broadcast slurry application leads to nutrient losses, air and water pollution, greenhouse gas emissions and—in particular in a warming climate—to soil N mining. Here we test the alternative slurry acidification and injection techniques for their mitigation potential compared to broadcast spreading in montane grassland. We determined (1) the fate of $^{15}$N labelled slurry in the plant-soil-microbe system and soil-atmosphere exchange of greenhouse gases over one fertilization/harvest cycle and (2) assessed the longer-term contribution of fertilizer $^{15}$N to soil organic N formation by the end of the growing season. The isotope tracing approach was combined with a space for time climate change experiment. Simulated climate change increased productivity, ecosystem respiration, and net methane uptake irrespective of management, but the generally low N$_2$O fluxes remained unchanged. Compared to the broadcast spreading, slurry acidification showed lowest N losses, thus increased productivity and fertilizer N use efficiency (38% $^{15}$N recovery in plant aboveground plant biomass). In contrast, slurry injection showed highest total fertilizer N losses, but increased fertilization-induced soil organic N formation by 9–12 kg N ha$^{−1}$ season$^{−1}$. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000152071
Veröffentlicht am 31.10.2022
Originalveröffentlichung
DOI: 10.1007/s10705-022-10239-9
Scopus
Zitationen: 4
Web of Science
Zitationen: 3
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 1385-1314, 0167-1731, 1573-0867, 2214-7055
KITopen-ID: 1000152071
HGF-Programm 12.11.23 (POF IV, LK 01) Adaptation of managed landscapes to climate change
Erschienen in Nutrient Cycling in Agroecosystems
Verlag Springer
Band 125
Heft 2
Seiten 171–186
Vorab online veröffentlicht am 15.10.2022
Schlagwörter 15N tracing, Organic fertilizer, SON formation, Methane, Nitrous oxide, Slurry treatment
Nachgewiesen in Web of Science
Dimensions
Scopus
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