Loganathan, P.Fernando, T.W.2014-06-032014-06-031977Tropical Agriculturist, 133(2):p.105-116https://dl-cri.nsf.gov.lk//handle/1/3088FertilizersEppawela saphosSuperphosphateEvaluationEfficiencies of Eppawela Saphos and concentrated superphosphates:in some coconut soils of Sri Lanka - A laboratory evaluation