A. Tawfiq A, S. Alsaadawi I. Allelopathic Effect of Root Exudates of Two Sunflower Cultivars on Companion Weeds. Iraqi Journal of Science. 2023;55(4A):1516-1509. Accessed January 4, 2026. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/11247