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Effect of slurry application techniques on nitrous oxide emission from temperate grassland under varying soil and climatic conditions

  • The effect of slurry application techniques and slurry N stabilizing strategies on nitrous oxide emission from grasslands is poorly understood and, therefore, can result in large uncertainties in national/regional inventories. Field experiments were, thus, conducted to estimate the effect of different fertilization techniques on nitrous oxide (N2O) emissions. Fertilizer was applied (135–270 kg N ha−1 year−1) as calcium ammonium nitrate (CAN), untreated or treated cattle slurry. The slurry was either treated with sulfuric acid (target pH = 6.0), applied using trailing shoes or treated with 3,4-dimethyl pyrazole phosphate and applied via slot injection. N2O fluxes were sampled using the closed chamber technique. Cumulative N2O emissions ranged 0.1–2.9 kg N ha−1 year−1 across the treatment, sites and years. The N application techniques showed inconsistent effects on soil mineral N content, cumulative N2O emission and N yield. The fertilizer replacement value of slurry was low due to low N use efficiencies at the sites. However, a close positive relationship (r = 0.5; p = .013) between slurry value and biomass yield was observed, highlighting the benefit of high slurry value on crop productivity. N2O-N emission factors were low for all treatments, including CAN, but were 2–6 times higher in 2019 than in 2020 due to lower precipitation in 2020. Variations in N2O emission were largely explained by soil and climatic factors. Even with the low N2O emissions, this study highlights the benefit (significant mitigation of N2O emissions) of replacing the increasingly expensive chemical fertilizer N with input from slurry under favourable conditions for denitrification.

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Author:John Kormla NyameasemORCiD, Reiner RuserORCiD, Christof KlußORCiD, Christoph Essich, Mareike Zutz, Martin ten HufORCiD, Caroline Buchen-TschiskaleORCiD, Heinz Flessa, Hans-Werner OlfsORCiD, Friedhelm TaubeORCiD, Thorsten ReinschORCiD
Title (English):Effect of slurry application techniques on nitrous oxide emission from temperate grassland under varying soil and climatic conditions
Parent Title (English):Grass and Forage Science
Document Type:Article
Year of Completion:2023
Release Date:2024/05/23
Tag:Greenhouse gas emissions; Livestock; Manure; Nitrogen cycling; Nitrogen use efficiency
First Page:338
Last Page:358
Faculties:Fakultät AuL
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 630 Landwirtschaft, Veterinärmedizin
Review Status:Veröffentlichte Fassung/Verlagsversion
Peer Reviewed
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International