Wijewardena, J.D.H.Amarasiri, S.L.2020-09-022020-09-021990Tropical Agriculturist, 146:p.57-66https://dl-doa.nsf.gov.lk/handle/1/2743NATURAL RESOURCES AND ENVIRONMENTAcid soilEppawala rock phosphateHigh citric acid soluble rock phosphateTriple superphosphateUpcountryVegetablesComparison of phosphate sources on growth of vegetables on an acid soilArticle