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On fertilizer bags, the first of three... | Almanac.com

On fertilizer bags, the first of three...

Question
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On fertilizer bags, the first of three numbers (i.e., “xx” in “xx yy zz”) is the nitrogen content. What are the yy and zz numbers? Isn’t one of them phosphate?
Answer
The other numbers indicate the phosphorus (P) and potassium (K) content of the fertilizer.