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Sæbø, A.* ; Persson, T.* ; Schröder, P. ; Hanslin, H.M.*

N fertilization strategies for the use of P-rich organic amendments in the restoration of soil productivity—short-term responses in two soils.

Front. Sustain. Food Syst. 8, DOI: 10.3389/fsufs.2024.1332357 (2024)
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To facilitate nutrient management and the use of manure as a feedstock for biogas production, manure is often separated into a solid and a liquid fraction. The former fraction is usually high in P and low in N, so when incorporated in the soil as fertilizer, it needs to be supplemented by N from, e.g., mineral fertilizers or nitrogen-fixing species. To explore strategies to manage N with solid-separated manure, we examined how the amount of digestate and the N:P ratio of pig digestate, i.e., manure that had partially undergone anaerobic digestion, affected the productivity of Westerwolds ryegrass and red clover in a pot experiment with one soil which was rich and another which was poor in plant nutrients. The soil and plant species treatments were combined with four doses of digestate, which gave plant available phosphorus (P) concentrations of 2, 4, 8, or 16 mg P100 g−1 soil. Ammonium nitrate was dosed to obtain factorial combinations of digestate amount and N:P ratios of 1.8, 4, 8, and 16. Clover was harvested once at the beginning of flowering (15 weeks after seeding), while Westerwolds ryegrass was allowed to regrow three times after being cut at the shooting stage (in total, 4 cuts, 6, 9, 12, and 15 weeks after seeding). Ryegrass yield increased by up to 2.9 times with digestate dosage. Interactions with the N:P ratio and soil type were weak. Hence, the effect of increasing the N:P ratio was additive across digestate dosages. Red clover biomass also increased by up to 39% with digestate dosage. Residual nutrients in the soil after red clover cultivation were affected by the initial differences in soil characteristics but not by digestate treatment or biomass of harvested red clover. A targeted N management is required to benefit from the P-rich digestate in grass cultivation, while the long-term effects of red clover culture on N input need further investigation.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Digestate ; N:p Ratio ; Nitrogen ; Organic Soil Amendments ; Phosphorus ; Soil Productivity; Biological Nitrogen-fixation; Anaerobic-digestion; Manure; Phosphorus; Grassland
Sprache englisch
Veröffentlichungsjahr 2024
HGF-Berichtsjahr 2024
ISSN (print) / ISBN 2571-581X
e-ISSN 2571-581X
Zeitschrift Frontiers in Sustainable Food Systems
Quellenangaben Band: 8 Heft: , Seiten: , Artikelnummer: , Supplement: ,
Verlag Frontiers
Verlagsort Avenue Du Tribunal Federal 34, Lausanne, Ch-1015, Switzerland
Begutachtungsstatus Peer reviewed
Institut(e) Research Unit Environmental Simulation (EUS)
POF Topic(s) 30202 - Environmental Health
Forschungsfeld(er) Environmental Sciences
PSP-Element(e) G-504991-001
Förderungen FFL/JA mechanism
Norwegian Research Council
EU in the Facce Surplus program initiative
DOI 10.3389/fsufs.2024.1332357
WOS ID 001239720600001
Scopus ID 85195296499
Erfassungsdatum 2024-06-14
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