What Is NPK Fertilizer? - The Spruce2022-08-24
2023年3月2日 The letters "NPK" on a fertilizer label stand for nitrogen, phosphorus, and potassium, the three primary nutrients plants need to grow. The numbers on the label indicate the ratio (by percentage) of nitrogen, phosphorus, and potassium in the fertilizer container. Even if you do not see the letters N-P-K, but you see a set of three numbers,
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