AL-SHEIKH, Mohammad Ahmad; ABDULRAZZAK , Omar Abdullah; AL-KHALIFA , Taha Hammadi. Effect of Adding Potassium and Organic Fertilizers on the Soil NPK Content and the Productivity of maize (Zea mays L.). Kufa Journal for Agricultural Sciences, Kufa, Najaf, IRAQ, v. 16, n. 3, p. 152–163, 2024. DOI: 10.36077/kjas/2024/v16i3.15433. Disponível em: https://journal.uokufa.edu.iq/index.php/kjas/article/view/15433. Acesso em: 7 may. 2026.