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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.Item Studies on the mineral nutrition of tea - techniques for growing tea plants in sand culture(The Tea Research Institute. Talawakele, 1969) Pethyagoda, U.; Krishnapillai, S.; Nagarajah, S.Item Effect of forms and levels of nitrogen on the growth and accumulation of nitrogen , phosphorus potassium and calcium by young tea plants (Camellia sinensis L.) grown in sand culture(Tea Research Institute. Thalawakele, 1981) Krishnapillai, S.