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Item Biological N2 fixing capacity of Gliricidia sepium and Calliandra calothyrsus under different agroclimatic conditions(University of Ruhuna, Faculty of Agriculture:Kamburupitiya, 2000) Gunaratne, W.D.L.; Heenkenda, A.P.; Premakumara, K.V.S.; Bandara, W.M.S.R.Item 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.