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Energy self-reliance, net-energy production and GHG emissions in Danish organic cash crop farms

Halberg, N.; Dalgaard, R.; Olesen, J.E. and Dalgaard, T. (2008) Energy self-reliance, net-energy production and GHG emissions in Danish organic cash crop farms. Renewable Agriculture and Food Systems, 23 (1), pp. 30-37.

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Summary

Organicfarming(OF)principles include the idea of reducing dependence of fossil fuels, but little has been achieved on this objective so far in Danish OF. Energy use and green house gas (GHG)emissions from anaverage 39 ha cash crop farm were calculated and alternative crop rotations for bio-energy production were modeled. Growing rape seed on 10% of the land could produce bio-diesel to replace 50–60% of the tractor diesel used on the farm. Increasing grass-clover area to 20% of the land and using half of this yield for biogas production could change the cash crop farm to an etenergy producer, and reduce GHG emissions while reducing the overall output of products only marginally. Increasing grass-clover area would improve the nutrient management on the farm and eliminate dependence on conventional pig slurry if the biogas residues were returned to cash crop fields.


EPrint Type:Journal paper
Keywords:biogas, energy, life cycle assessment,greenhouse gas,rapeseed,crop rotation
Subjects: Farming Systems
Crop husbandry
Research affiliation: Denmark > DARCOF III (2005-2010) > BIOCONCENS - Biomass and bio-energy production in organic agriculture
Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
Deposited By: Hansen, Grethe
ID Code:15565
Deposited On:23 Mar 2009
Last Modified:12 Apr 2010 07:39
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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