N-P-K

N-P-K

(chemical engineering)
The code identifying the components in a fertilizer mixture: nitrogen (N), phosphorus pentoxide (P), and potassium oxide (K). Fertilizers are graded in the order N-P-K, with the numbers indicating the percentage of the total weight of each component. For example, 5-10-10 represents a mixture containing by weight 5% nitrogen, 10% phosphorus pentoxide, and 10% potassium oxide.
References in periodicals archive ?
The variables for this project are: (1) water collected from Lake Erie with plant species added and no additional nutrients, (2) water from Lake Erie with plant species and a 10 ppm dose of N-P-K added, (3) water from Lake Erie with plant species and a 20 ppm dose of N-P-K added.