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Item Fertilizer nitrogen utilization by tea(TRI:Talawakele, 1981) Wickremasinghe, K.N.Item Effect of urea and ammonium sulphate on the nitrification and the release of potassium , magnesium and calcium in acid tea soils(Tea Research Institute. Talawakelle, 1985) Wickremasinghe, K.N.; Nalliah, P.; Wijedasa, M.A.Item Studies on the use of urea as a fertilizer for tea in Ceylon I. introduction and preliminary observations(TRI. Talawakele, 1970) Bhavanandan, V.P.