Erschienen:
Springer Science and Business Media LLC, 2021
Erschienen in:Nutrient Cycling in Agroecosystems
Sprache:
Englisch
DOI:
10.1007/s10705-021-10127-8
ISSN:
1573-0867;
1385-1314
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Winter oilseed rape (WOSR) is the major oil crop cultivated in Europe and the most important feedstock for biodiesel. Up to 90% of the greenhouse gas (GHG) emissions from biodiesel production can occur during oilseed rape cultivation. Therefore, mitigation strategies are required and need to focus on direct nitrous oxide (N<jats:sub>2</jats:sub>O) emission as one of the largest GHG contributors in biodiesel production. Earlier studies show that nitrification inhibitors (NIs) can reduce N<jats:sub>2</jats:sub>O emissions derived from N-fertilization. Since information on the effect of biogas digestates with or without NIs on N<jats:sub>2</jats:sub>O emissions from WOSR fields is scarce, the aim of this study was to evaluate their effects on N<jats:sub>2</jats:sub>O emissions, mineral N dynamics, and oil yield in WOSR production fertilized with digestate. The study was conducted at five sites across Germany over three years resulting in 15 full site-years data sets. Across all sites and years, N<jats:sub>2</jats:sub>O emission from WOSR fertilized with biogas digestate (180 kg NH<jats:sub>4</jats:sub><jats:sup>+</jats:sup>-N ha<jats:sup>−1</jats:sup>yr<jats:sup>−1</jats:sup>) ranged between 0.2 and 3.5 kg N<jats:sub>2</jats:sub>O–N ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>. Due to the reduction of the nitrate concentrations following digestate application, application of NI significantly reduced annual N<jats:sub>2</jats:sub>O emission by 36%. Our results demonstrate that NI can be an effective measure for reducing N<jats:sub>2</jats:sub>O emissions from digestate application, but its effectiveness depends on soil and weather conditions, and ultimately on the site-specific potential for N<jats:sub>2</jats:sub>O production and release. There was no effect of NI application on grain and oil yield.</jats:p>