Abstract: Roses are the most popular flower in the floriculture sector globally because of their remarkable quality and quantity. They are used for cut flower production, yard beautification, and pot plant growing, among other things. Jharkhand has a burgeoning floriculture industry that grows five commercial varieties of roses, gladiolus, gerberas, marigolds, and Chrysanthemums in open fields. In Jharkhand, there are over 1.20 lakh hectares planted with flowers; the industry is expanding. (Database NHB, 2021). But since the green revolution, there are serious ecological and environmental concerns associated with the extensive use of chemical pesticides and fertilisers. There is a movement in favour of organic agricultural methods to address this problem. As a possible addition to mineral fertilisers, biostimulants have gained popularity since they may increase crop quality and production.
The effects of several biostimulants in conjunction with recommended fertiliser dosages (RDF) on the development and flowering of Mainu Parle rose cultivars were evaluated through an experiment. Out of all the therapies that were tried, RDF with humic acid (T3) showed some significant results. The maximum plant height (86.50 cm), highest leaf count (104.68), highest number of flowering shoots per plant (11.40), longest shoot length at first flower bud appearance (34.38 cm), highest number of flowers per plant (28.20), and largest flower diameter (11.75 cm) were all displayed by plants treated with RDF + humic acid. These results demonstrate how humic acid may be used as a helpful biostimulant in rose culture, providing encouraging opportunities to increase growth and flower output while lowering dependency on chemical inputs.
