AL-Kendi ع. إ., and Basbaa ع. خ. “The Effect of Nitrogen, Phosphorus, Iron and Zinc Fertilization on Vegetative Growth of Maize (Zea Mays L.) under Delta Tuban Conditions”. University of Aden Journal of Natural and Applied Sciences, vol. 19, no. 1, Apr. 2015, pp. 25-34, doi:10.47372/uajnas.2015.n1.a03.