?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=R.K.&rft.au=Upadhyay%2C+R.K.&rft.aulast=Upadhyay&rft.atitle=Natural+nitrification+inhibitors+for+higher+nitrogen+use+efficiency%2C+crop+yield%2C+and+for+curtailing+global+warming&rft.title=Journal+of+Tropical+Agriculture&rft.issn=0971-636X&rft.date=2011&rft.volume=49&rft.pages=19-24&rft.issue=1-2&rft.genre=article