“Effectiveness of Bio-Organic Fertilizer Formulas to Increase Productivity of Upland Rice and Dehydrogenase Activity in Lampung Acid Upland”. JOURNAL OF TROPICAL SOILS, vol. 20, no. 2, Apr. 2016, pp. 85-93, https://doi.org/10.5400/jts.2015.v20i2.85-93.