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Item Efficiency of peat-mixed rock phosphates on some alfiisols and ultisols of Sri Lanka(Soil Science Society of Sri Lanka:Colombo, 1996) Ratnayake, M.P.K.; Kumaragamage, D.; Dahanayake, K.Item Comparison of selectively mined apatite crystals and commercially available rock phosphate from Eppawala, as P fertilizers for flooded rice(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1994) Ratnayake, M.P.K.; Kumaragamage, D.; Dahanayake, K.Item A comparison of citric acid solubilities of commercially available Eppawala rock phosphate and selectively mined primary apatite crystals after mixing with peat(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1993) Rathnayake, M.P.K.; Kumaragamage, D.; Dahanayake, K.