Syawal Harahap, Fitra, Arman Harahap, Iman Arman, and Simon Haholongan Sidabukke. 2025. “Physical Properties Of Ultisol Soil In Pangkatan Sub-District With The Provision Of Organic Material Types”. International Journal of Science and Environment (IJSE) 5 (2):80-84. https://doi.org/10.51601/ijse.v5i2.155.