SUHARDJADINATA, .; SUNARYA, Y.; TEDJANINGSIH, T. Increasing Nitrogen Fertilizer Efficiency on Wetland Rice by Using Humic Acid. JOURNAL OF TROPICAL SOILS, [S. l.], v. 20, n. 3, p. 143–148, 2016. DOI: 10.5400/jts.2015.v20i3.143-148. Disponível em: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/231. Acesso em: 2 aug. 2025.