What is the K in fertilizer?

Regardless of its type, any fertilizer you buy will come with information about the nutrients it contains. Prominently featured will be the N-P-K ratio, the percentage the product contains by volume of nitrogen (chemical symbol N), phosphorus (P), and potassium (K).

What does the N stand for in NPK?

NPK stands for "nitrogen, phosphorus, and potassium," the three nutrients that compose complete fertilizers. Also implied is a percentage symbol after each number because each of the three numbers represents the percentage of that nutrient in the makeup of the fertilizer.

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