?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Hoyer%2C+Dipl.Ing.agr.+Uta&rft.aulast=Hoyer&rft.aufirst=Uta&rft.date=2006&rft.title=Development+of+a+method+for+balancing+soil+organic+matter+in+organic+agriculture+for+practical+application&rft.genre=proceeding