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Item Rock phosphate fertilizers with special reference to Eppawala(Rubber Research Institute. Agalawatte, 1996) Dissanayake, D.M.A.P.; Perera, A.M.A.; Jayalath, A.Item Stability of Mica, K-feldspar and apatite in water, organic matters and citric acid(2007) Amaraweera, T.H.N.G.; Pitawala, H.M.T.G.A.; Fernando, G.W.A.R.