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¹ Van Yüzüncü Yıl Üniversitesi Tarla Bitkileri Bölümü, Van DOI : 10.16882/derim.2019.537609 Viewed : 2148 - Downloaded : 1094 Research was carried out to determine the effects of different salt sources (control, NaCl, KCl and CaCl₂) at the 150 mM dose and seaweed (Ascophyllum nodosum) extract concentrations (control, 2, 4 and 6 cc l-1) on growth parameters with biochemical changes in Echinacea (Echinaceae purpurea L.). The factorial experiment based on completely randomized design performed in growth chamber conditions with four replicates. In experiment, parameters such as leaf area, chlorophyll content, ion leakage in leaf tissues, MDA levels, relative water content in leaf tissues and membrane endurance index were investigated. In study, it was determined that salt stress decreased leaf area, chlorophyll content, membrane endurance index, relative water content in leaf tissues; MDA levels with ion leakage in leaf tissues were increased. All of the investigated parameters increased significantly except for MDA level and ion leakage in leaf tissues due to seaweed applications. Keywords : Seaweed; Salt stress; Echinaceae purpurea L.