?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=K+L&rft.au=Sahrawat%2C+K+L&rft.aulast=Sahrawat&rft.atitle=Effects+of+Pesticides+on+Nitrogen+Fixation&rft.title=Pesticides&rft.date=1975&rft.pages=21-23&rft.genre=article