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Organic field beans have low nitrous oxide emissions and high N-efficiency

Paper i proceeding
Författare Åsa Kasimir Klemedtsson
Josefine Nylinder
Leif Klemedtsson
Publicerad i Nitrogen & Global Change 2011, Key Findings - Future Challenges
Publiceringsår 2011
Publicerad vid Institutionen för geovetenskaper
Institutionen för växt- och miljövetenskaper
Språk en
Länkar nitrogen.ceh.ac.uk/nitrogen2011/
Ämneskategorier Biologiska vetenskaper, Växtproduktion, Markvetenskap

Sammanfattning

It has earlier been argued that organic farming is not as efficient as conventional, concerning yields and N retention. In search for agricultural systems having high N-efficiency and low N2O emission we have measured nitrous oxide (N2O) emission in organic and conventional (integrated) fields. In contrast to the suspicions we found in average a fairly low N2O emission for the organic beans (in average 0.39 kg N ha-1 y-1), also lower than conventional beans (2.3 kg N ha-1 y-1). The efficiency of the agricultural system can be expressed as N2O intensity, emission per harvest, aiming for a low number. The organic beans had the lowest intensity compared to the conventional beans (6 g respectively 22 g N2 Methods/ApproachO-N per kg N in harvest), this due to larger emission for conventional beans. The lower harvest for organic beans had a small impact on the intensity. The high emissions for conventional cropping system were found in autumn after harvest and RoundUp application, mitigation options may be found here.

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