Enhancing Rootstock Biomass Production in Picrorhiza kurroa through Growth Regulator Treatment

Effect of different concentrations and dipping time periods of growth regulators IAA, IBA, NAA and GA₃ on ischolar_maining, field survival and ischolar_mainstock biomass yield in important endangered alpine medicinal plant Picrorhiza kurroa revealed that pre-planting treatments of stolon cuttings by IBA 100ppm for 24 hrs resulted in maximum sprouting percentage (88.89 %), field survival (77.18 %) and dry ischolar_main-stock (economic part) biomass yield of 7.8 g/plant after two years. Treated cuttings can be directly field planted which can reduce the cost. An estimated yield of approximately 577 kg of dry ischolar_mainstock per hectare can be obtained after two years of field growth.