Page 1/22 Improving Essential Oil Compositions of Purple Coneｧower (Echinacea Purpurea L.) Medicinal Plant Using Novel Growing Media and Nutrition Pattern in Hydroponics Fatemeh Ahmadi Urmia University Abbas Samadi (  asamadi2@gmail.com ) Urmia University Ebrahim Sepehr Urmia University Amir Rahimi Urmia University Sergey Shabala University of Tasmania Research Article Keywords: Ammonium, Echinacea, Hydroponics, Perlite size, Secondary metabolites DOI: https://doi.org/10.21203/rs.3.rs-146246/v1 License:   This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License