Considering the demand for transforming poultry waste into eco-friendly manure, we carbonized chicken manure at 402, 449 and 528 °C and determined the physicochemical properties. We evaluated the effectiveness of the ensuing carbonized chicken manure (CCM) as a fertilizer using Brassica rapa, var. komatsuna and Oryza sativa L., var. japonica, cv. Koshihikari, in the upland and the paddy field soil, respectively. Herein, we carried out duplicate treatment of CCM (carbonized at 528 °C) either alone or in combination with nitrogen and measured the growth from three or more plants. The plots with the recommended chemical fertilizers containing nitrogen (N), phosphorus (P) and potassium (K) and with no fertilizers were used as controls for growth measurement. The vessel tests indicated that when applied alone, the CCM plot could not support the normal growth of both the plants. However, the CCM plot restored the plant growth with simultaneous application of nitrogen, and the growth in the CCM + N plot was comparable to that observed in the NPK plot. By estimating the growth in the NPK plots as 100%, the growth percentages of fresh weights of komatsuna were 12% in the CCM plot, 79% in the N plot and 99% in the CCM + N plot. Likewise, the plant heights of Koshihikari were 43% in the CCM plot, 77% in the N plot and 99% in the CCM + N plot. Our data suggest CCM supplementation to N fertilizers as a potential replacement of inorganic fertilizers like P and K for effective environmental management.