AL-Dawdi , Ali H., Khalid KH. AL-Jobouri, and Mohmmed I. AL-Agidy. 2015. “PERFORMANCE OF THREE MAIZE HYBRIDS (Zea Mays L.) TO PLANT DENSITY AND NITROGEN FERTILIZER”. Diyala Agricultural Sciences Journal 7 (1):133-47. https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/1564.