H. H, Mindari W, Priyadarshini R. Characterization of Humic Acid Using E4/E6 Ratio in Various Land Uses in Jatiarjo Village, Prigen District, Pasuruan. etj [Internet]. 2024 Jun. 1 [cited 2024 Nov. 24];9(6):4179-85. Available from: https://everant.org/index.php/etj/article/view/1349