Journal of the Soil Science Society of Sri Lanka

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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.
Effect of applied N,P and K on growth and yield of cardamom (Elettaria cardamomum Maton)
(Soil Science Society of Sri Lanka:Colombo, 1992) Sumanasena, H.A.; Dharmadasa, M.; Gunaratne, W.D.L.; Wickramasinghe, P.J.
Efficiency of partially acidulated Eppawala phosphate rock as a phosphorus source for potato and vegetables
(Soil Science Society of Sri Lanka:Colombo, 1998) Wijewardana, J.D.H.; Yapa, U.W.S.P.