U. Amri, F. . Syawal Harahap, N. . Elizabeth Mustamu, and L. . Fadillah Zamzami, “Evaluation of Soil Nutrition Content of Phosphore (P) and Organic-C in Thre Locations of Intensive Rice Field in Balige District”, IJSE, vol. 4, no. 1, pp. 23–27, Feb. 2024.