Abstract
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 cm2) 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).
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