NPK

(also N-P-K) the ratio of nitrogen (N), phosphorus (P) and potassium (K) indicated by three numbers on a fertilizer label. N-P-K numbers represent the percentages of these nutrients in a product, by total weight. See also: fertilizer, nutrients.
Found on https://www.pennington.com/all-products/fertilizer/resources/glossary-terms

NPK

Nitrogen, Phosphorous, Potassium (Primary fertilizer components).
Found on http://www.encyclo.co.uk/local/21816

NPK

Scientific shorthand for nitrogen, phosphorus, and potassium, the three nutrients used in greatest quantity by plants. The three-number formula (5-10-5, 20-20-20) on fertilizer labels identifies a product's NPK content
Found on http://www.greeneducationfoundation.org/greenthumbchallengesub/gardening-re
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