. Surono, E. Santosa, . Subowo, . Elsanti, and . Khamdanah, “Effectiveness of Bio-organic Fertilizer Formulas to Increase Productivity of Upland Rice and Dehydrogenase Activity in Lampung Acid Upland”, j Trop. Soils, vol. 20, no. 2, pp. 85–93, Apr. 2016.