Experiment was carried out to study the influence of different levels of nitrogen, potassium and their combination in form of foliar spray on dendrobium plants grown in a naturally ventilated polyhouse at floriculture farm of ASPEE College of Horticulture and Forestry for two years (2014-15 and 2015-16). The study was carried out in a completely randomized design with nine treatments T 1 [(10% N + 10% K) +Water], T 2 [(10% N + 10% K) + Vermiwash], T 3 [(10% N + 10% K) + Cow urine], T 4 [(20% N + 20% K) + Water], T 5 [(20% N + 20% K) + Vermiwash], T 6 [(20% N + 20% K) + Cow urine], T 7 [(30% N + 30% K) + Water], T 8 [(30% N + 30% K) + Vermiwash] and T 9 [(30% N + 30% K) + Cow urine]. Inorganic fertilizers i.e. nitrogen and potassium were given in form of foliar spray once every week in a concentration of 0.2 %, while, organic fertilizers such as vermiwash and cow urine were sprayed in a concentration of 2 % once every fortnight. Significantly maximum height of plant, number of leaves, leaf area and number of shoots were produced by application of -treatment T 9 [(30% N + 30% K) + Cow urine]. Flowering characters viz. inflorescence length, rachis length, number of inflorescence, number of florets and post-harvest life of inflorescence were also found significantly highest with treatment T 9 [(30% N + 30% K)

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Investigation was done to study the effect of foliar spray of plant growth regulators on growth and flowering of potted hibiscus plants grown in pot during 2017-18 and 2018-19. Application of gibberellic acid, benzyl adenine and salicylic acid at different concentrations found significant in influencing the vegetative growth, flowering parameters and plant pigments of Hibiscus rosa-sinensis plants during both the years as compared to untreated plants (control). Plants sprayed with 100 ppm gibberellic acid resulted in to maximum plant height (24.90, 26.77 and 28.93 cm), plant spread and leaf area (15.55, 16.17 and 16.48 cm 2 ) respectively at 30, 60 and 90 days after spraying (DAS). While, maximum number of branches (4.63, 5.45 and 6.02) and leaves (26.57, 31.33 and 35.65) was recorded in plants sprayed with 50 ppm gibberellic acid, respectively at 30, 60 and 90 days after spraying (DAS). Maximum number of flowers per plant, flowers per branch, flower diameter, flowering period and in situ flower longevity was observed in hibiscus plants sprayed with 100 ppm gibberellic acid. The plants receiving the same treatments also increased chlorophyll content in leaves (19.50, 20.37 and 20.85 mg/g) and anthocynin in flower (17.03, 18.65 and 20.20 mg/g), respectively at 30, 60 and 90 days after spraying (DAS).