What does 'NPK' in fertilizer refer to?

'NPK' refers specifically to the essential nutrients that are critical for plant growth: Nitrogen, Phosphorus, and Potassium. These three elements are the primary macronutrients found in fertilizers and are represented by their chemical symbols—N for Nitrogen, P for Phosphorus, and K for Potassium.

Nitrogen is crucial for leaf and stem growth as it plays a vital role in the synthesis of proteins and chlorophyll, which is necessary for photosynthesis. Phosphorus is important for root development, flowering, and the overall energy transfer within the plant. Potassium helps regulate various physiological processes, including water uptake, enzyme activation, and overall plant health.

Understanding the significance of these nutrients helps landscape contractors and gardeners effectively choose the right fertilizers for their specific plants and soil conditions, ensuring optimal growth and health.