D. P. Nasution, U. M. Kasi, F. Razie, N. A. Syarifuddin, and D. Neina, “Pre-Terra Preta formulation improves forage quality of Pennisetum purpureum cv. Mott on marginal land”, Sains Tanah J. Soil Sci. Agroclimatology, vol. 23, no. 1, pp. 120–130, Jun. 2026, doi: 10.20961/stjssa.v23i1.115256.