Effect of Mineral and Organic Fertilization on the Production of some Medicinal Active Compounds Extracted from Dahlia Plants

Abstract

This research study was carried out in the Research farm of the Horticulture Department, Faculty of Agriculture, Ain Shams University, Egypt. Open-field pot experiments were executed for the duration of the two consecutive winter seasons of 2020/2021 and 2021/2022 on dahlia plant. Combinations of chemical and organic fertilizers were applied to improve quality of dahlia tuberous roots. Total
phenolic, total flavonoid and total sugar contents in dahlia tuberous roots were increased significantly with the triple combination treatment from 2% compost tea, 2% vinasse and 5 ppm boron foliar spray under Kristalon fertilizer at rate 100% from the recommended dose and gave the highest values (62.51, 4.84 and 35.39 mg/g) especially in season 2021 and comparative results in season 2022. Compost tea as an individual fertilizer treatment without mixing led to the highest values of total phenolic and total
flavonoid content (40.25 mg/g and 2.83 mg/g) under 100% level of Kristalon fertilizer, while vinasse as an individual fertilizer treatment led to the highest amount of total sugar content with 35.18 mg/g under 100% level of Kristalon fertilizer, in both years 2021 and 2022, in respect order.