?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.scitotenv.2016.08.093&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Liu%2C+W.&rft.aulast=Liu&rft.aufirst=W.&rft.volume=572&rft.date=1+December+2016&rft.issn=00489697&rft.atitle=Global+assessment+of+nitrogen+losses+and+trade-offs+with+yields+from+major+crop+cultivations&rft.title=Science+of+The+Total+Environment&rft.pages=526-537&rft.genre=article