A study analyzed fertilizer efficiency for major crops in Hunan Province and found correction factors for soil nutrients. Available phosphorus had the highest correction coefficient at 161.55%, followed by potassium at 68.30%, and nitrogen at 38.25%. The study showed that soil available nutrient correction factors were negatively correlated with their corresponding nutrient contents. By using regression analysis, a hyperbolic model was found to be the best fit for the data. This model can help estimate fertilizer rates accurately for different crops, providing a scientific basis for fertilizing formulas.