?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Askegaard%2C+Senior+Scientist+Margrethe&rft.aulast=Askegaard&rft.aufirst=Margrethe&rft.date=2006&rft.title=Performance+of+spring+barley+in+an+organic+mixed+crop+rotation+&rft.genre=proceeding