A successful conversion of plant biomass to organic fertilizer for maize cultivation was achieved, and its performance was compared to inorganic fertilizers, NPK 20:10:5 and rabbit manure. Fertilizer C has a Total nitrogen content of (2.18%), Total phosphorus (1.80 %), Total potassium (3.77 %) and Total Carbon (37.40%) at a pH of 5. Maximum plant height of 171.45 cm for synthesize fertilizer, 134.0 cm for NPK fertilizer, 121.92 cm for rabbit manure and 101.98 cm for control were observed respectively. The most promising treatment was fertilizer C with high a higher percentage of potassium 3.77% compared to NPK fertilizer 5% and with generally higher nutrient concentration compared to rabbit manure. Fertilizer C demonstrated robust plant growth and development even without supplementary inorganic nitrogen in the form of urea. It outperformed all other samples, displaying superior yield compared to rabbit manure. Notably, the addition of 2.55g of thiourea to 19.30g of fertilizer C led to optimal yield, indicating that less than 11% by mass of thiourea addition yields superior results compared to NPK 20:10:5 fertilizers. Fertilizer C also exhibited rapid nutrient release and higher residual organic matter content compared to both NPK and manure. Nutrient consumed for Fertilizer C: N ≈ 91.25%, P ≈ 76.11%, K ≈ 90.64%. for NPK: N ≈ 99.95%, P ≈ 99.94%, P ≈ 99.77%. while for Manure: N ≈ 95.04%, P ≈ 90.48%, K ≈ 91.19% respectively. This underscores the potential for achieving both rapid and slow nutrient release without compromising soil health, as the residual organic matter, a carbon-rich material, decomposes gradually. This underscores that the treatment of agricultural plant residue can significantly influence its suitability as organic fertilizer and soil amendment due to its organic matter content.