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Understanding The NPK Ratio

Posted July 03, 2017

Our Blends Vs. Single Ingredient Fertilizers Explained.

Fertilizers are labeled with numbers that represent the percentage of the three primary macronutrients, nitrogen (N, phosphorus (P) and potassium (K) that are immediately available in the fertilizer.  These elements are listed as the NPK ratio.

For example, our All Purpose 4-6-2 is a Blended Fertilizer comprised of each primary nutrient, whereas our Blood Meal 12-0-0 is a Single Ingredient Fertilizer with a single source of nitrogen.  Each nutrient plays specific and complementary roles. 

  • N = Nitrogen - Energizes vegetative growth
  • P = Phosphorus - Produces expansive roots, fruits and viable seeds.
  • K = Potassium - (or potash) Promotes resistance to disease and temperature stress.
Most fertilizers will also contain varying amounts of secondary macronutrients - calcium, sulfur and magnesium - along with trace elements or micronutrients.

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