Labeling of fertilizer
Common labeling conventions The NPK analysis label. Fertilizers are usually labeled with three numbers, as in 182010, indiing the relative content of the macronutrients nitrogen (N), phosphorus (P), and potassium (K), respectively.. More precisely, the first number ("N value") is the percentage of elemental nitrogen by weight in the fertilizer; that is, the mass fraction of nitrogen times ...
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