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Nitrification inhibitors reduce N 2 O emissions induced by application of biogas digestate to oilseed rape
Nutrient Cycling in Agroecosystems ( IF 3.1 ) Pub Date : 2021-03-15 , DOI: 10.1007/s10705-021-10127-8
Katharina Kesenheimer , Jürgen Augustin , Hannes Hegewald , Sarah Köbke , Klaus Dittert , Thomas Räbiger , Teresa Suárez Quiñones , Annette Prochnow , Jens Hartung , Roland Fuß , Heinz Stichnothe , Heinz Flessa , Reiner Ruser

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 (N2O) emission as one of the largest GHG contributors in biodiesel production. Earlier studies show that nitrification inhibitors (NIs) can reduce N2O emissions derived from N-fertilization. Since information on the effect of biogas digestates with or without NIs on N2O emissions from WOSR fields is scarce, the aim of this study was to evaluate their effects on N2O 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, N2O emission from WOSR fertilized with biogas digestate (180 kg NH4+-N ha−1yr−1) ranged between 0.2 and 3.5 kg N2O–N ha−1 yr−1. Due to the reduction of the nitrate concentrations following digestate application, application of NI significantly reduced annual N2O emission by 36%. Our results demonstrate that NI can be an effective measure for reducing N2O emissions from digestate application, but its effectiveness depends on soil and weather conditions, and ultimately on the site-specific potential for N2O production and release. There was no effect of NI application on grain and oil yield.



中文翻译:

硝化抑制剂减少了将沼气消化物施用到油菜中而引起的N 2 O排放

冬季油菜(WOSR)是欧洲种植的主要油料作物,也是生物柴油的最重要原料。油菜种植过程中,多达90%的生物柴油生产温室气体(GHG)排放会发生。因此,需要采取缓解策略,并将其重点放在作为生物柴油生产中最大的温室气体排放源之一的直接一氧化二氮(N 2 O)排放上。早期的研究表明,硝化抑制剂(NIs)可以减少氮肥产生的N 2 O排放。由于关于有或没有NIs的沼气消化对WOSR田N 2 O排放影响的信息很少,因此本研究的目的是评估其对N 2的影响。用消化液施肥的WOSR生产中的O排放,矿物N动态和油产量。这项研究历时三年在德国的五个站点进行,得出了15个完整站点年的数据集。在所有地点和年份中,用沼气消化液(180 kg NH 4 + -N ha -1 yr -1)施肥的WOSR的N 2 O排放量介于0.2和3.5 kg N 2 O–N ha -1  yr -1之间。由于使用消化液后硝酸盐浓度降低,因此使用NI可以显着减少年N 2 O排放量36%。我们的结果表明,NI可以作为减少N 2的有效措施。消化过程中产生的O排放物,但其有效性取决于土壤和天气条件,最终取决于特定场所中N 2 O产生和释放的潜力。NI的施用对谷物和油的产量没有影响。

更新日期:2021-03-15
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