Dapour, Ahmed El-Sayed. “The Effects of Different Seed Priming Agents on Improving Emergence, Growth, Yield and Essential Oil Percentage of Purple Coneflower (Echinacea Angustifolia DC.) under Field Condition”. Fundamental and Applied Agriculture 7, no. 2 (June 30, 2022): 84–93. Accessed November 22, 2024. http://f2ffoundation.org/faa/index.php/home/article/view/283.