You can use it to calculate the weight of fertilizer materials to supply the amounts of N, P, and K. There are three fertilizer materials used in this application. 1. Urea (46–0–0) N 2. Di–Ammonium Phosphate – DAP (18–46–0) P 3. Muriate of Potash – MOP (0–0–60) K Main features 1. calculate the weight of fertilizer materials to supply the amounts of N, P, and K. 2. calculate the approximate price. 3. provide recommended fertilizer formulae.