T. Rashad, Rama. “Relationship Between the Absorption Behavior of Iron and Silicon by Plant and the Macronutrients Affected by Some Sandy Soil Additives”. Asian Journal of Soil Science and Plant Nutrition 1, no. 3 (August 8, 2017): 1-12. Accessed February 19, 2020. http://journalajsspn.com/index.php/AJSSPN/article/view/223.