Labeling of fertilizer
NPK and other labeling conventions for fertilizer / From Wikipedia, the free encyclopedia
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"NPK" redirects here. For other uses, see NPK (disambiguation).
Many countries have standardized the labeling of fertilizers to indicate their contents of major nutrients.[1][2] The most common labeling convention, the NPK or N-P-K label, shows the amounts of the chemical elements nitrogen, phosphorus, and potassium.