This study was conducted for comparing three slow release N fertilizers namely, sulphur-coated urea (SCU), phosphorus – coated urea (PCU) and Enciabene with the conventional fast release N fertilizer namely ammonium nitrate each at the recommended rate of N i.e., 1000 g N/tree/year for growth characters on the three growth flushes, percentages of leaf N, P and K in the Spring growth cycle, date of first bloom, number of panicles/tree, fruit retention %, yield as well as physical and chemical characters of fruits in two mango cvs Figri Kelan and Keitt during 2004 and 2005 seasons. Results showed that suppling the trees of both mango cvs with the three slow release N fertilizers were superior to the application of the fast one in improving shoot length, number of leaves / shoot and leaf area in the three growth cycles, percentages of leaf N, number of panicles / tree as well as physical and chemical properies of the fruits. The slow release N fertilizers slightly advanced first bloom date. Application of sulphur-coated urea (SCU), phosphorus-coated urea (PCU) and Enciabene (ENC) in a descending order, was very favorable in this connection. These results were true for both mango cvs. It is suggested to fertilize the trees of both mango cvs Figri Kelan and Keitt with N at 1000g/tree/year as sulphur-coated urea fertilizer (2.4 Kg/tree/year) for obtaining an economical yield with fairly good fruit quality