Ratnayake, M.P.K.Kumaragamage, D.Dahanayake, K.2014-11-122014-11-121994Tropical Agricultural Research, 6:p.223-230https://dl.nsf.gov.lk/handle/1/11820AgricultureApatiteCrystalsPhosphateEppawalaFertilizersComparison of selectively mined apatite crystals and commercially available rock phosphate from Eppawala, as P fertilizers for flooded riceA