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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 Factors affecting nitrification in tea soil and in stored solution(Tea Research Institute. Thalawakele, 1980) Krishnapillai, S.; Pethiyagoda, U.