Abstract—During our research we investigated the purple coneflower's (Echinacea purpurea L.) herb yield's and it's essential oil active agents' change under different fertilization settings in small-plot trial. We measured the raw drug yield, which we harvested in 2016 and in 2017. We made the harvest and all other works manually. We dried the harvested herba under prenumbra for three weeks. Based on the data, every fertilization settings' yield was less than...[Read more]