Efficacy of Water Hyacinth-Derived Humic Acid on Soybean (Glycine max (L.) Merrill) Growth in Coastal Sandy SoilOkti Purwaningsih, Isadin Muhammad Althesa, Azizah Nur Uswatun Hasanah and Puguh Bintang PamungkasBIO Web Conf., 244 (2026) 01005DOI: https://doi.org/10.1051/bioconf/202624401005