الشماع ل. and بكر ر. 2024. EFFECT OF SOWING DATES AT GDD AND CROP GROWTH OF THREE SUNFLOWER (Genotypes Helianthus annuus L. ). Iraqi Journal of Science. 49, 2 (Nov. 2024), 48–56. DOI:https://doi.org/10.24996/ijs.2008.49.2.%g.