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How are fertilizers classified?

Updated: 9/16/2023
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12y ago

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Mainly by organic/natural vs. inorganic/chemical/man-made, although they are also classified by nutrient content. For example, a commonly available man-made garden fertilizer might say "16-16-16-4S" on the label. Using the common nomenclature in the fertilizer industry, this means that it contains 16% nitrogen, 16% phophorus, 16% potassium, and 4% sulfur.

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