The labeling of fertilizer containers such as 10-20-15 represent what?

Question

WHat percent of N, P,K?

10 percent of something

20 percent of something

15 percent of something

*the somethings are N, P, and K

Answer 1

It means 10 percent Nitrogen, 20 percent Phosphorus and 15 percent Potassium.  They use K because the atom potassium is labeled as K on the periodic table because it used to be called Kaolinite.

Answer 2

Nitrogen, Phosphorus and potassium.

Nitrogen           gives greener plant

Phosphorus      helps growth and stamina

Potassium        helps with growth