Herviyanti, ., T. B. Prasetyo, F. Ahmad, and A. Saidi. “Humic Acid and Water Management to Decrease Ferro (Fe2+) Solution and Increase Productivity of Established New Rice Field”. JOURNAL OF TROPICAL SOILS, vol. 17, no. 1, May 2019, pp. 9-17, doi:10.5400/jts.2012.v17i1.9-17.