On the research farm “Logården” in south-west Sweden organic and integrated conventional farming systems has continued since 1991. The soil is characterized by an average clay content of 40 % and the crop rotations a 7 years sequence; where faba bean and spring wheat occurred one year each in both managements. Neither organic nor integrated beans received any nitrogen addition, but a difference was that the integrated fields had an under-sown catch crop while the organic fields were weeded by hoe where a catch-crop was not possible. At both fields of wheat, a green manure crop was under-sown while only the conventional field received 110-120 kg N-fertilizer. N₂O emission rate was measured by manual chambers and gas samples were collected every second week and more frequent during freeze/thaw events and at occasions of management.

We present N₂O flux data from the measurements in faba beans and spring wheat during April 2005 to Mars 2006 and April 2006 to Mars 2007. Lowest average of N₂O emission was found in the organic wheat (0.2 kg N ha^-1) while the integrated beans had the highest emission (2.3 kg N ha^-1). The organic beans had statistically lower emission compared to the integrated. But for wheat this was found only in one year. Yield-scaled N₂O emission (emitted N₂O-N per harvested N) was found the lowest for both wheat production forms and the organically produced faba beans, ca 10 g N₂O-N kg^-1 N in harvest, but two times higher for the integrated beans.