“Effect of different Levels of Fertilizer (DAP) onthe Publican (Calotropis procera) Leaves Content of Phenol and (N, P, K) Compounds” (2021) Damascus University Journal of agriculture sciences, 34(1). Available at: https://journal.damascusuniversity.edu.sy/index.php/agrj/article/view/203 (Accessed: 18 June 2026).