The palm oil (Elaeis guineensis) agroindustries in Pucallpa produce as residues, seed shells (cuescos) contaminating the soil; the raising of cattle, originates manure (vacaza), that produces polluting gases; and, the deterioration of soils by overgrazing, are environmental problems that need viable solutions. The present investigation evaluated the improvement of the physicochemical properties of degraded soils by overgrazing, applying biochar made from pyrolysis pits and enriched in cow biol produced by anaerobic fermentation. The methodology comprised a Completely Random Block Design (DBCA) with a control (T0) and three treatments (T1, T2, T3), with 5, 10 and 15 t h-1 of enriched biochar respectively, randomly assigned in triplicate to 16 experimental units of 2.4 m by 5.0 m (12 m2) each, contained in four blocks. Statistical analysis included the Shapiro-Wilks and Levenne test, also ...