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Item Humification of polyphenol-rich plant residues(Tea Research Institute. Thalawakele, 1984) Sivapalan, K.Item The biochemistry of soil humus some current concepts(Tea Research Institute. Talawakelle, 1986) Sivapalan, K.Item Humified phenol-rich plant residues and soil urease activity(Tea Research Institute. Thalawakele, 1983) Sivapalan, K.; Fernando, V.; Thenabadu, M.W.Item Phenolics and the exchange capacity of humic materials (short communication)(Tea Research Institute. Thalawakele, 1983) Sivapalan, K.