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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Issue 12 (1952) → A Simple Guide to Understanding Fertilizers

A Simple Guide to Understanding Fertilizers

Commercial fertilizer is identified by means of a numerical formula (as 5-10-5) which tells how much of each of the three principal plant nutrients it contains. The first number in this formula always refers to the percent of nitrogen (N) in the mixture, the middle number indicates the percent of phosphoric acid (P205), and the last number refers to the percent of potassium oxide (K2O).


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Author(s): Charles C. Mony

Publication: Tree Planters' Notes - Issue 12 (1952)