Kulasooriya, S.A.2012-04-102012-04-102000Tropical Agricultural Research and Extension3(1)pp.25-31https://dl.nsf.gov.lk/handle/1/8123AgricultureNitrogen fixationNitrogen substrate labelling techniquesNuclear techniquesNatural fertilizersRice farmingPotential of azolla as a biofertilizer for rice farming in Sri Lanka. demonstrated by isotopic techniquesArticle