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ORGANICALLY GROWN FIELD BEANS – LOW NITROUS OXIDE EMISSION AND HIGH N-EFFICIENCY

Paper i proceeding
Författare Åsa Kasimir Klemedtsson
Publicerad i 24th NJF congress, Food, Feed, Fuel and Fun – Nordic Light on Future Land Use and Rural Development
Publiceringsår 2011
Publicerad vid Institutionen för geovetenskaper
Språk en
Ämneskategorier Naturvetenskap, Växtproduktion, Markvetenskap

Sammanfattning

In search for agricultural systems having high N-efficiency and low N2O emission we have measured nitrous oxide (N2O) emission in different management systems, organic and conventional (integrated). It is important to measure in a long time experiment since the emission is influenced by both preceding year field management and the very recent. The Logården research farm was chosen since the same 7 year crop rotation sequence has prevailed in parallel for 20 years. Of the rotation crops the faba bean was selected for comparing emissions during two years, April 2005 to Mars 2007. Neither system received any additional nitrogen. The measurements used static chambers and gas chromatography. The organic beans showed a fairly low N2O emission (0.4±0.07 kg N ha-1 y-1), which was found six times higher for conventional field beans (2.3±0.8 kg N ha-1 y-1). This was due to high emissions for the conventional beans during the autumn after harvesting and RoundUp addition. The efficiency of the agricultural system can be expressed as N2O intensity, aiming a low intensity. Notwithstanding, lower yields for organic farming, the organic beans showed the lowest intensity, 6 (g N2O-N per kg N in yield) compared to 22 for the conventional beans, since a larger difference in emission than in yield was found.

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