Herlambang, Susila, Muammar Gomareuzzaman, Perwitasari Perwitasari, Amara Seva Azalikha, and Wahyu Tri Muhardi. 2026. “Biochar and Humic Acid Effects on Soil Properties and Soybean Growth in Coastal Sandy Soil”. RSF Conference Series: Engineering and Technology 5 (1):175-85. https://doi.org/10.31098/cset.v5i1.1183.