NOVELTY - High-efficiency organic fertilizer comprises (in parts by weight) thoroughly decomposed livestock manures (10-25) with urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) (1-3), maize straws (60-70), trace elements (0-3), turfs (10-20) and magnesium (0-1).    USE - Used as a high-efficiency organic fertilizer.    ADVANTAGE - The fertilizer: regulates and controls carbon nitrogen ratio in the organic materials and the activity of the urease; maintains stable ammonia ions to increase the utilization ratio of the nitrogen in the soil and maintains stable proportion of nitrogen, phosphorus and potassium in the soil to balance the effect of fertilization; increases the utilization ratio of the nutrients present in it; satisfies and provides multiple nutrients for growth of the plants; and improves the soil, protects the environment, regulates the growth of the plants and enhances the yield and quality of the products.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the high-efficiency organic fertilizer, comprising mixing and composting under nitrogen protection by: grinding the maize straws having 20-35% of water not greater than 40 meshes, uniformly mixing (in parts) maize straws (60-70), turfs (10-20) having 20-35 wt.% of water, trace elements (0-3), magnesium (0-1) and livestock manures (10-25) having 60-85 wt.% of water and stacking in a triangular strip in a wood box to compost outdoor at 15-35 degrees C; regulating water ratio of the mixed materials as 55-65 wt.% and the carbon nitrogen ratio as 30:1-25:1, adding the complex microbial agent 301, turning over the mixed materials to create the best reaction environment so that the materials fully contact the oxide to make the generated organic fertilizer reach the optimal effect; adding urease inhibitor NBPT (1-3) when turning over for the first time under nitrogen protection and deodorizing; fermenting for 25-40 days, turning over for 2-4 times each week, during first two weeks turning over at 1-3 times each week, and turning over for 10-15 times, where water ratio of the final mixed materials is about 25-30%; sieving the large particles having diameter greater than 10 mm which is not fully decomposed thoroughly by a sieving machine, composting and turning over again; adding the fully-thoroughly-decomposed particles with the diameter that is not greater than 20 mm into a stirrer, uniformly stirring, feeding into the roller drier to dry, cooling to obtain the black high-efficiency organic fertilizer containing high-capacity nitrogen, where the water ratio of the organic fertilizer is 5-20 wt.% and the drying temperature is 60-120 degrees C when drying.