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 ?
Different cultivation method criteria consisted of pinching site (30 and 60 cm), planting time (March 30, April 15, and April 30), and fertilizer ratio (N-P-K, 10.5-8.5-8.5: 50 kg/10a; 2N-P-K, 21-8.5-8.5: 50 kg/10a; N-2P-K, 10.5-17-8.5: 50 kg/10a; N-P-2K, 10.5-8.5-17: 50 kg/10a; 2N-2P-2K, 21-17-17: 50 kg/10a).
When fertilizer ratio was varied (N-P-K, 2N-P-K, N-2P-K, N-P-2K, and 2N-2P-2K), the total eleutherosides B (1) and E (2) contents were found to range from 4.417 to 6.905 and from 3.652 to 7.227 mg/g in the upper and lower parts of A.
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.