Tip #2,210 • 8 people found helpful Purchased fertilizers list the proportions of nitrogen (N), phosphorus (P) and potassium (K), always in that order. For example, a 21-7-14 fertilizer has 21% nitrogen, 7% phosphorus and 14% potassium, or potash. Home & Garden garden yard Helpful... Share Share Tweet Send Please enable JavaScript to view the comments powered by Disqus.