Adding urease inhibitors to nitrogen fertilizers is a new technology developed at the end of the last century. NBPT (N-(n-butyl)thiophosphoric triamide) acts as both an inhibitor and a slow-release agent. On the one hand, it effectively slows down the enzymatic decomposition of nitrogen fertilizer into ammonia, reducing waste and extending the diffusion time of the fertilizer at the application point. This synchronizes soil nutrient supply with crop nutrient demand, thereby increasing the effective utilization rate of nitrogen fertilizer by 30% to 40%, and extending the fertilizer effect from 50 days to approximately 120 days, almost covering the entire growth period of the crop. This eliminates the need for secondary topdressing. It is very effective for crops with long growth periods, such as fruit trees and corn. NBPT, as a soil nitrogen fertilizer enzyme inhibitor, is highly efficient, non-toxic, and has no side effects on the soil. It naturally degrades into ammonia and phosphorus in the soil, which can also be absorbed by crop roots as fertilizer. Furthermore, it reduces the toxic effects of ammonia gas on seed germination and seedling growth, making it an excellent soil nitrogen fertilizer enzyme inhibitor.