Gunapala, N.Amarasiri, S.L.2021-03-312021-03-311983Tropical Agriculturist, 139:p.85-95https://dl-doa.nsf.gov.lk/handle/1/3113AZOLLAOrganic manuresNitrogenChemical fertilizersPhosphorusEffect of addition of phosphorus on the growth of AzollaArticle