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Item Influence of levels of nitrogen and potassium fertilizers on chlorophyll content in mature clonal tea leaves(Tea Research Institute. Talawakelle, 1986) Krishnapillai, S.; Ediriweera, V.L.Item Studies on the mineral nutrition of tea 4 - ammonium and nitrate as forms of nitrogen for tea plants in sand culture(Tea Research Institute. Thalawakele, 1971) Pethiyagoda, U.; Krishnapillai, S.