title: Nitrogen fixation by Azolla in rice fields.
mesh_terms: 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
chemical_list: D009591:Nitrogenase; D000114:Acetylene