?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=A+rapid+method+for+determination+of+nitrate%2C+nitrite%2C+and+ammoniacal+nitrogen+in+soils&rft.title=Plant+and+Soil&rft.date=1975&rft.volume=42&rft.pages=305-308&rft.issue=1&rft.genre=article