?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Entz%2C+Martin&rft.aulast=Entz&rft.aufirst=Martin&rft.date=2005&rft.title=Influence+of+Organic+Management+with+Different+Crop+Rotations+on+Selected+Productivity+Parameters+in+a+Long-Term+Canadian+Field+Study+&rft.genre=proceeding