What do N, P, and K stand for on fertilizer labeling?

• A. Nitrogen - Phosphorus - Potassium
• B. Sodium - Phosphorus - Potassium
• C. Nitrogen - Potassium - Phosphorus
• D. NPK values by percentage

Answer: (A)

On fertilizer labeling, N, P, and K stand for three essential plant nutrients: nitrogen, phosphorus, and potassium. The three numbers shown on the label represent the percentage by weight of each nutrient in that order. For example, a fertilizer labeled 20-10-10 contains 20% nitrogen, 10% phosphorus (as phosphate), and 10% potassium (as potash), with the rest being fillers or other nutrients. Nitrogen drives leafy growth, phosphorus supports root development and flowering, and potassium boosts overall vigor and resilience. Sodium isn’t part of this trio, so it wouldn’t be described by N, P, and K. The N-P-K labeling is simply a concise way to convey the main nutrients provided.