“The Effect of Foliar Spray by Mixture of Boron and Zinc on Yield and Fruit Quality of Var. AL Khelkhaly Olive Tree”. (2020) Journal of Hama University, 3(5). Available at: https://hama-univ.edu.sy/ojs/index.php/huj/article/view/371 (Accessed: 26 April 2026).