Fertilizer analysis The Plumeria > Fertilizer analysis Posted on September 13, 2016November 10, 2022 by PlumeriaDB ALL0-9ABCDEFGHIJKLMNOPQRSTUVWXYZ Share This Tweet Share The amount of nitrogen, phosphorus (as P2O5), and potassium (as K2O) in a fertilizer expressed as a percentage of total fertilizer weight. Nitrogen (N) is always listed first, phosphorus (P) second, and potassium (K) third. Related Articles: How to read a Fertilizer LabelSoils and Growing Mediums