Kartini K, Ramadhan TH, Sasli I. Improving the Productivity of Hybrid Maize through Soil Ameliorant and NPK Fertilizer Applications on Ultisols: Peningkatan Produktivitas Jagung Hibrida melalui Pengaplikasian Amelioran dan Pupuk NPK pada Tanah Ultisol. agri. j. ilmu. pertan. [Internet]. 2025 Dec. 1 [cited 2026 Apr. 25];14(2):70-7. Available from: https://ojs.uwgms.ac.id/index.php/agrifarm/article/view/3726