Kulasooriya, S.A.Hirimburegama, W.K.2010-07-062010-07-061982Journal of the National Science Council of Sri Lanka, 10(2):p.205-212https://dl.nsf.gov.lk/handle/1/6176BiofertilizersSoil water cultureChemical technologyGrowth and nitrogen fixation in Azolla pinnata under field conditionsArticle