The Leaching Process of Acid Sulphate Soil by One-and Two-Way Flow Systems in the Katingan Swamp Irrigation AreaSiswoyo Hadi, Endita Prima Ari Pratiwi and Budi Santoso WignyosukartoE3S Web of Conf., 517 (2024) 04004DOI: https://doi.org/10.1051/e3sconf/202451704004