Abeykoon, V.2020-09-022020-09-021989Tropical Agriculturist, 145:p.45-59https://dl-doa.nsf.gov.lk/handle/1/2684ROCK PHOSPHATEEppawala rock phosphatePartially acidulated phosphate rockSechura rock phosphateEffectiveness of partially acidulated phosphate rock (PAPR) prepared from Eppawala rock phosphate as a phosphorus fertilizerArticle