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Item Organic tea cultivation(Tea Research Institute:Thalawakele, 1999) Gaffar, N.M.A.Item Studies on the mineral nutrition of tea - 4 ammonium and nitrate as forms of nitrogen fro tea plants in sand culture(The Tea Research Institute. Talawakele, 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.