?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Davies%2C+Gareth&rft.aulast=Davies&rft.aufirst=Gareth&rft.date=2002&rft.title=The+effect+of+organic+amendments+on+clubroot+(Plasmodiophora+brassicae)&rft.genre=proceeding