Nitrogen fixation by Azolla in rice fields.
D000114:Acetylene / Q000378:metabolism; D000383:Agriculture; D002455:Cell Division; D009586:Nitrogen Fixation; D009591:Nitrogenase / Q000378:metabolism; D012275:Oryza / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D012621:Seasons; D013045:Species Specificity; D013559:Symbiosis
D009591:Nitrogenase; D000114:Acetylene