Effect of Fertilizer Treatment and Harvesting Time on Principal Chemical Constituents of Oroxylum indicum Vent. and Andrographis paniculata Nees

Analysis of two medicinal plants, Andrographis paniculata (Andrographolide) and Oroxylum indicum (mixture of oroxylin A & chrysin) content was carried out under different fertilizer treatments and at different physiological stages of plants. Total ash, water-soluble ash, acid insoluble ash, alcohol soluble extractives and water-soluble extractives for the above plant species were estimated alongwith thin layer chromatography examination. Maximum andrographolide content of 2.0% was found in 120 days old plants and among the treatments given to plants, the chemical fertilizer treatment influenced the Andrographolide, alcohol soluble extractive and water-soluble extractive. In case of Oroxylum indicum, all other evaluated compounds other than oroxylin-A and chrysin content were found to be almost similar whereas oroxylin-A and chrysin content was found maximum in mature tree ischolar_main bark i.e. 0.7%. The results of present study show that fertilizer treatments given to plants and time of harvesting affect the chemical constituents of plants.