M. A. AL-Sheikh, O. A. Abdulrazzak, and T. H. Al-Khalifa, “Effect of Adding Potassium and Organic Fertilizers on the Soil NPK Content and the Productivity of maize (Zea mays L.)”, Kufa Jour. Agri. Sci., vol. 16, no. 3, pp. 152–163, Sep. 2024, doi: 10.36077/kjas/2024/v16i3.15433.