?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Farthofer%2C+R.&rft.aulast=Farthofer&rft.aufirst=R.&rft.date=2004&rft.title=Plant+biomass+nitrogen+and+effects+on+the+risk+of+nitrate+leaching+of+intercrops+under+organic+farming+in+Eastern+Austria&rft.genre=proceeding