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Item Green manuring for soil productivity management(Soil Science Society of Sri Lanka:Colombo, 2003) Gunaratne, W.D.L.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.