Vestenaa, Morten Winther; Lauersen, Casper; Husted, Majken; Reimer, Marie; Hermansen, Sven; jensen, Anders Peter and Tersbøl, Michael (editor): Vestenaa, Morten Winther (Ed.) (2025) Kløvergræs til biogas og økologiske plantebaserede sædskifter. [Grass clover for biogas and organic plant based crop rotations.] Innovationcenter for Organic Farming, Aarhus N.
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Summary
Rapporten undersøger potentialet for at anvende økologisk kløvergræs til biogas som grundlag for plantebaseret gødning i økologiske planteavlssystemer uden husdyr. Baggrunden er, at tilgængeligheden af kvælstof udgør en central begrænsning for udviklingen af husdyruafhængig økologisk planteproduktion. Analyser af sædskifter viser, at kløvergræs kan levere betydelige mængder biologisk fikseret kvælstof, som efter afgasning kan tilbageføres som en effektiv gødning. Resultaterne indikerer, at afgasset kløvergræs har en gødningsværdi på niveau med eller højere end husdyrgødning, primært som følge af øget ammoniumandel og forbedret tilgængelighed af kvælstof. Økonomiske vurderinger peger på, at værdien af kløvergræs til biogas afhænger af metanpotentiale, håndteringsomkostninger og markedsvilkår for biogas og grønne certifikater. Samtidig viser analyser, at systemer med kløvergræs til biogas kan reducere klimabelastningen betydeligt, blandt andet gennem fortrængning af fossil energi og øget kulstoflagring i jorden. Rapporten identificerer dog væsentlige barrierer for implementering, herunder økonomisk usikkerhed, transport- og logistikomkostninger, samt landmændenes afhængighed af husdyrgødning. Omvendt fremhæves agronomiske fordele ved kløvergræs i sædskiftet, såsom forbedret jordfrugtbarhed, ukrudtssanering og øget biodiversitet. Samlet set konkluderer rapporten, at kløvergræs til biogas har potentiale som en central komponent i fremtidens økologiske plantebaserede landbrug, men at realisering kræver økonomisk robuste værdikæder, teknologisk udvikling og stærkere samarbejde mellem planteavlere og biogasanlæg.
Summary translation
This report examines the potential of using organic clover grass for biogas production as a basis for plant-based fertilization in organic arable systems without livestock. The study addresses a key challenge in organic farming: limited nitrogen availability in livestock-free systems. Crop rotation analyses demonstrate that clover grass can supply substantial amounts of biologically fixed nitrogen, which, after anaerobic digestion, can be returned as an effective fertilizer. Results show that digestate from clover grass can achieve fertilizer values comparable to or higher than conventional manure, mainly due to increased ammonium content and improved nitrogen availability. Economic assessments indicate that the value of clover grass for biogas depends on methane potential, handling costs, and market conditions for biogas and green certificates. Climate analyses further suggest that systems incorporating clover grass for biogas can significantly reduce greenhouse gas emissions through fossil fuel substitution and enhanced soil carbon sequestration. However, the report identifies key barriers to implementation, including economic uncertainty, transport and logistics costs, and farmers’ continued reliance on animal manure. At the same time, important agronomic benefits of clover grass are highlighted, such as improved soil fertility, weed control, and biodiversity. Overall, the findings suggest that clover grass for biogas can become a key component in future organic plant-based farming systems, but successful implementation requires economically viable value chains, technological development, and stronger collaboration between arable farmers and biogas plants.
| EPrint Type: | Report |
|---|---|
| Agrovoc keywords: | Language Value URI English biogas http://aims.fao.org/aos/agrovoc/c_9262 English grass clover http://aims.fao.org/aos/agrovoc/c_cdb03095 English fertilizer technology http://aims.fao.org/aos/agrovoc/c_27895 |
| Subjects: | Farming Systems > Farm economics Food systems > Recycling, balancing and resource management Farming Systems > Social aspects Environmental aspects > Air and water emissions Farming Systems > Farm nutrient management |
| Research affiliation: | Denmark > Innovationscenter for Økologisk Landbrug (ICOEL) |
| Deposited By: | Winther Vestenaa, Mr Morten |
| ID Code: | 57442 |
| Deposited On: | 06 Apr 2026 07:17 |
| Last Modified: | 06 Apr 2026 07:17 |
| Document Language: | Danish/Dansk |
| Status: | Published |
| Refereed: | Not peer-reviewed |
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