“Effect of adding zeolite and sewage sludge on the available of microelements in light texture calcareous soil”, مجلة للعلوم الزراعية, vol. 37, no. 2, Nov. 2021, Accessed: Jun. 18, 2026. [Online]. Available: https://journal.damascusuniversity.edu.sy/index.php/agrj/article/view/537