Mhmood, Jawad Taha. “RESPONAS OF GROWTH CHARACTERSTICS AND YIELD OF POTATO FERTILIZED WITH ORGANIC MATTER TO THE SPRAY OF FE AND ZN ”. Diyala Agricultural Sciences Journal , vol. 5, no. 2, Dec. 2013, pp. 637-4, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/2847.