Kareem Salman Al-Mafraji, M., and M. . Ahmed Ibraihi AL-Anbari. “Study of Genotypic and Phenotypic Correlations and Stepwise Regression Analysis in Maize Under the Influence of Combinations of Nitrogen Fertilization and Humic Acid”. Pure Sciences International Journal of Kerbala, vol. 1, no. 2, June 2024, http://journals.uokerbala.edu.iq/index.php/psijk/article/view/1408.