CAMPOS, Diogo Fabrício; DE MIRANDA, Neli Branco; SERRANO, Dominicky Cristina; GEHRKE, Aline Gonçalves; BOTTON, Vanderleia. Extraction of humic and fulvic acids from leonardite for agricultural biostimulant applications. Engineering and Sustainability Journal, [S. l.], v. 1, n. 1, p. e006, 2026. DOI: 10.68418/apj47y03. Disponível em: https://angola-journals.com/index.php/esj/article/view/24. Acesso em: 27 oct. 2026.