Effect of Ethephon, Boron and Zinc Spray on Anatomical Characters of Sunflower Crop (Helianthus annuus L.). Iraqi Journal of Science [Internet]. 2024 Jan. 26 [cited 2024 Dec. 19];54(4Appendix):1078-83. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12425