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Consequences of agro-biofuel production for greenhouse gas emissions

Carter, Mette S.; Hauggaard-Nielsen, Henrik; Johansen, Anders and Ambus, Per (2009) Consequences of agro-biofuel production for greenhouse gas emissions. In: NJF Report, Vol. 5, No 3, NJF General Secretariat, Stockholm, Sweden, pp. 34-35.

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Summary

Currently CO2 from fossil fuel combustion accounts for 57% of the global greenhouse gas emissions, whereas the strong greenhouse gases nitrous oxide (N2O) and methane (CH4) contribute with 8% and 14%, respectively (IPCC, 2007). Agricultural activity is the dominant source of N2O, which is mainly associated with the use of nitrogen based fertilizers in agricultural production. Replacing fossil fuel-derived energy by biomass-derived energy is commonly and with increasing emphasis proposed as a mean to mitigate the CO2 emissions. However, a recent analysis of global emission data proposes that accelerated emissions of N2O associated with the production of biomass for bio-fuel purposes will outweigh the avoided emissions of fossil fuel-derived CO2 (Crutzen et al., 2008).
In the present study we examined the effects on N2O and CH4 emissions when residues from bio-energy production were recycled as fertilizer for a maize energy crop within an organic cropping system. Furthermore, we assessed sustainability in terms of greenhouse gasses for co-production of bio-ethanol and bio-gas from maize. This was compared to estimated greenhouse gas balances for rye and grass-clover as alternative raw materials.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Biogas; Bioethanol; Anaerobic digestion; Slurry; Maize; Winter rye; Grass-clover; N2O; CH4;
Subjects: Soil > Nutrient turnover
Food systems > Recycling, balancing and resource management
Environmental aspects > Air and water emissions
Crop husbandry > Composting and manuring
Research affiliation: Denmark > DARCOF III (2005-2010) > BIOCONCENS - Biomass and bio-energy production in organic agriculture
Deposited By: Carter, Mette Sustmann
ID Code:16179
Deposited On:17 Mar 2010 12:24
Last Modified:30 Aug 2011 10:35
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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