Lelesz J Éva, József Csajbók. The changes of the purple coneflower’s (Echinacea purpurea L.) herb and radix drug yield under different fertilization conditions. Acta agrar. Debr. [Internet]. 2019 May 23 [cited 2024 May 19];(1):79-83. Available from: https://ojs.lib.unideb.hu/actaagrar/article/view/2375