Quantitative Design of Nitrogen, Phosphorus, and Potassium Ratios: Calculating Compound Fertilizer Formulations Using the Material Balance Method
Basic Principles of Formulation Calculation: The core of compound fertilizer formulation is determining the percentage content of nitrogen, phosphorus, and potassium. The basic principle of calculation is "material balance"—the total required nutrients equal to the sum of the nutrients provided by each raw material. Although some algebraic calculations are involved, the core idea is not complicated: set up unknowns, establish equations, and solve. As long as this idea is grasped, manual calculation can be completed. The formula can be summarized as: Target Nutrient Content = Σ(Raw Material Amount × Raw Material Nutrient Content) / Total Feed Amount.
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