Balakrishnamurthi, T.S.2014-06-032014-06-031975Paper presented at the Annual Sessions of the Sri Lanka Association for the Advancement of Science, Sri Lanka, 1975:p...https://dl-cri.nsf.gov.lk//handle/1/3039FertilizersComparative studiesFertilizer sourcesEppawela apatiteRock phosphate