Campos, Diogo Fabrício, Neli Branco de Miranda, Dominicky Cristina Serrano, Aline Gonçalves Gehrke, and Vanderleia Botton. 2026. “Extraction of Humic and Fulvic Acids from Leonardite for Agricultural Biostimulant Applications”. Engineering and Sustainability Journal 1 (1): e006. https://doi.org/10.68418/apj47y03.