Effect of anaerobic digestion of manure before application to soil – benefits for nitrogen utilisation?

IF 1.2 Q4 ENVIRONMENTAL SCIENCES
B. Foereid, J. Szőcs, R. Patinvoh, I. S. Horváth
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引用次数: 4

Abstract

Purpose Anaerobic digestion produces renewable energy, biogas, from organic residues, but also digestate, a valuable organic fertiliser. Previous studies have indicated that digestate contains ample plant available nitrogen (N), but there are also concerns about greenhouse gas (GHG) emissions after application of digestates to soil. The aim of this study was to compare digestate and undigested feedstock for fertiliser effect as well as greenhouse gas emissions during the next season. Methods Digestate and its feedstock, manure, were compared as N fertilisers for wheat. Mixing digestate with biochar before application was also tested. After harvest, soil samples were frozen and dried. Then GHG emissions immediately after a re-wetting of dry soil and after thawing of frozen soil were measured to determine emissions after a non-growing season (dry or cold). Results All N in digestate was plant available, while there was no significant N fertiliser effect of the undigested manure. N2O emissions were higher after a dry season than after freezing, but the undigested manure showed higher emissions during thawing than those detected during thawing of soils from any of the other treatments. Conclusion Anaerobic digestion makes N available to plants, and when residues with much N that is not plant available the first season are used, the risk of N2O emission next spring is high.
施肥前粪肥厌氧消化对土壤氮素利用的影响?
厌氧消化产生可再生能源,沼气,从有机残留物,但也消化,一种有价值的有机肥料。以往的研究表明,沼液含有丰富的植物有效氮(N),但也存在将沼液施用于土壤后温室气体(GHG)排放的担忧。本研究的目的是比较已消化和未消化的原料在下一季节的肥料效应以及温室气体排放。方法以小麦为原料,比较消化液和粪肥作为氮肥。在施用前还对沼液与生物炭进行了混合试验。收获后,将土壤样品冷冻干燥。然后,在干燥土壤重新湿润和冻土解冻后立即测量温室气体排放量,以确定非生长季节(干燥或寒冷)后的排放量。结果猪粪中所有氮素均为植物可利用,未消化的粪便无显著的氮肥效应。旱季后的N2O排放量高于冻结后的排放量,但未消化的粪便在解冻期间的排放量高于其他任何处理的土壤解冻期间的排放量。结论厌氧消化使N被植物利用,当使用第一季未被植物利用的N含量较高的残留物时,来年春季N2O排放的风险较高。
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来源期刊
CiteScore
2.10
自引率
26.70%
发文量
0
审稿时长
13 weeks
期刊介绍: The International Journal of Recycling of Organic Waste in Agriculture is an open access journal that publishes high-quality solicited and unsolicited articles, in all areas of Recycling of organic waste including: -Solid waste reuse in agriculture -Waste water reuse in agriculture -Utilization of organic wastes: composting -Ways to reduce, reuse and recycle organic waste -Social and economic impact of reduction, reuse and recycling of organic waste in agriculture -Methods to raise the public awareness of recycling and reuse of organic waste in agriculture -Organic waste utilization in animal and poultry nutrition -Urban food waste composting
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