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Large variation in nitrogen efficiency among organic and non-organic farms

Hansen, Sissel; Koesling, Matthias; Schüler, Maximilian; Fystro, Gustav and Bleken, Marina Azzaroli (2016) Large variation in nitrogen efficiency among organic and non-organic farms. In: Delin, Sofia (Ed.) Abstracts of 19th Nitrogen workshop: Efficient use of different sources of nitrogen in agriculture – from theory to practice, SLU, Skara, Sweden, Nitrogen Workshop, pp. 82-83.

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Online at: http://akkonferens.slu.se/nitrogenworkshop/wp-content/uploads/sites/18/2014/05/Nitrogen-Absracts-USB_ny.pdf

Summary

Agricultural production is requested to be environmental friendly and resource efficient. A literature review of farm surveys and prototype farm studies found that increasing use of N fertilizer and imported feed increased the yields and the productivity of dairy farms, but also increased the N-surplus. We studied the N-efficiency and cause of variation in organic and non-organic commercial dairy farms.
Increased amount of purchased-N per ha farmland increased the farm N-surplus per ha on organic
and non-organic farms. Increased amount of purchased-N tended to decrease N-efficiency, but not
on non-organic farms. The correlation between the N-surplus per unit of produce and N-purchase
was weak.
The organic farms had lower N-surplus per ha than the conventional farms, had higher efficiency
of imported nitrogen and lower N-surplus per unit of produce, leading to an overall better
utilization of available N.
Within organic and non-organic farm management, the variation in estimated N-efficiencies is
larger than the differences between the averages of these two groups.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:nitrogen N-surplus organic farming dairy farming Nitrogen overskudd økologisk landbruk melkeproduksjon
Subjects: Animal husbandry > Production systems
Animal husbandry > Production systems > Dairy cattle
Farming Systems > Farm nutrient management
Research affiliation: Germany > Federal Research Institute for Rural Areas, Forestry and Fisheries - VTI > Institute of Organic Farming - OEL
Norway > NMBU - Norwegian University of Life Sciences
Norway > NIBIO – Norwegian Institute of Bioeconomy Research
Norway > NORSØK - Norwegian Centre for Organic Agriculture
Deposited By: Hansen, Sissel
ID Code:31205
Deposited On:19 Feb 2017 08:08
Last Modified:19 Feb 2017 08:08
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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