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Increasing grassland productivity and reducing environmental N losses – Multiple benefits of advanced cattle slurry separation.
Agric. Ecosyst. Environ. 401:110275 (2026)
Verlagsversion
Forschungsdaten
DOI
Reducing the high nitrogen (N) losses during fertilization with cattle slurry is key to reduce environmental impacts of grassland farming. We tested the hitherto unknown potential of separated versus regular unseparated slurry (control) to mitigate total N losses in a three-year experiment using 15N-labelled slurry. Slurry separation was enhanced using starch, clay minerals, and centrifugation, yielding an organic-rich solid fraction and a liquid fraction with low dry-matter content and ca 70 % ammonium-N. The use of separated slurry significantly increased plant productivity (+12 %), plant N uptake (+21 %), and total biomass harvest N export (+20 %) compared to the control. Additionally, fertilizer N retention in topsoil organic N (SON) increased by 8 %. Due to higher plant uptake, and higher soil storage of fertilizer N, total gaseous N losses from separated slurry were lower (33.5 % of added N) than from regular slurry (57.6 %). Leaching of fertilizer N remained negligible in both treatments. However, this did not apply for N2O emissions, which were of low relevance for N balance considerations, but tripled after the addition of the liquid phase of separated slurry in summer. This undesired effect however might be prevented if the solid phase is applied in summer and the liquid phase in spring when soil microbial activity is still low. In summary, separated slurry reduced N losses, increased productivity, fodder quality, and fertilizer N retention, thereby mitigating N deficits and soil N mining. Thus, with appropriate application timing, use of separated slurry can enhance both ecological and economic soil functions and ecosystem services.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Productivity ; Slurry ; Grassland ; Separation (statistics) ; Nitrogen ; Vegetation (pathology); Soil Organic-matter; Liquid Dairy Manure; Nitrous-oxide; Montane Grasslands; Corn Yield; Nitrate; Fertilizer; Growth; Carbon; Mineralization
ISSN (print) / ISBN
0167-8809
e-ISSN
1873-2305
Zeitschrift
Agriculture, Ecosystems & Environment
Quellenangaben
Band: 401,
Artikelnummer: 110275
Verlag
Elsevier
Verlagsort
Radarweg 29, 1043 Nx Amsterdam, Netherlands
Begutachtungsstatus
Peer reviewed
Förderungen
Helmholtz TERENO (Terrestrial Environmental Observatories) initiative
German Federal Ministry of Education and Research (BMBF)
German Federal Ministry of Education and Research (BMBF)