?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=A&rft.au=Yamamoto%2C+A&rft.aulast=Yamamoto&rft.atitle=Relationship+between+chlorophyll+content+in+leaves+of+sorghum+and+pigeonpea+determined+by+extraction+method+and+by+chlorophyll+meter+(SPAD-502)&rft.title=Journal+of+Plant+Nutrition&rft.date=2002&rft.volume=25&rft.pages=2295-2301&rft.issue=10&rft.genre=article