An experiment entitled response of alstomeria to organic and inorganic fertilizers under protected conditions was conducted with three levels of nitrogen viz 150, 200 and 250 ppm/15 days of interval, two levels of phosphorus 100 and 150 kg/ha and three levels of organic manure Vermicompost 2.5 t/ha, FYM 5t/ha and sheep manure 5 t/ha respectively. The results revealed that various levels of nitrogen, Phosphorus and organic manure had a significant influence on various flowering parameters. Nitrogen at 250 ppm/15 days interval recorded minimum days to appearance of cymes (176.68 days) minimum days taken from appearance of cymes to flower harvesting stage (7.60 days) maximum duration of flowering flush (78.29) maximum number of flowering shoots/plant (91.99) and maximum total number of flowers per plant at 45 days for interval of 37-35 similarly the influence of phosphorus on various floral parameters was found significant with phosphorus level of 150 kg/ha recording minimum days to appearance of cymes (178.44) minimum days taken from appearance of cymes to flower harvesting stage (7.70), maximum duration of flowering flush (72.31 days) maximum number of flowering shoots/plant (84.71) and maximum total number of flowers/plant at 45 days of interval (35.79). Similarly among the organic manure Vermicompost recorded minimum days taken to appearance of cymes (179.26), minimum days taken from appearance of cymes to flower harvesting stage (7.68) maximum duration of flowering flush (74.86 days) and maximum total number of flowers per plant at 45 days of individual (40.49). The interaction between N3P1 recording minimum days (7.21) taken from appearance of cymes to flower harvesting stage, minimum duration of flowering flush (79.25 days) and maximum number of flowering shoots/plant (94.70). The interaction between N3O3 recorded maximum number of shoots per plant (96.49). The interaction between phosphorus and organic manure had a significant influence on recording minimum days taken from appearance of cymes to flower harvesting stage (7.22) at P2O3 and maximum number of flowering shoots /plant (89.88) at treatment combination of P1O3. The interaction effect of (NxPxO) were however non-significant.

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