?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=Nitrogen+supplying+ability+of+some+Philippine+rice+soils+&rft.title=Plant+and+Soil&rft.issn=0032-079X&rft.date=1980&rft.volume=55&rft.pages=181-187&rft.issue=2&rft.genre=article