“Provision of Urea Fertilizer and Chicken Manure on Chemical Characteristics of Inceptisol Soil in Pangkatan District”. Jurnal Online Pertanian Tropik 8, no. 3 (June 13, 2022): 215–221. Accessed February 4, 2026. https://idjpcr.usu.ac.id/jpt/article/view/8226.