Herviyanti, ., Prasetyo, T. B., Ahmad, F. and Saidi, A. (2019) “Humic Acid and Water Management to Decrease Ferro (Fe2+) Solution and Increase Productivity of Established New Rice Field”, JOURNAL OF TROPICAL SOILS, 17(1), pp. 9–17. doi: 10.5400/jts.2012.v17i1.9-17.