Fertilizer comes in different strengths and blends. The three numbers on the fertilizer bag show the percent by weight of the three major nutrients. The first number is always the percent nitrogen (N). The second is always the percent phosphate ( P2O5). The third number is always the percent potash (K2O).
Interpreation of the LSU AgCenter Soil Testing and Plant Analysis Laboratory results.
The LSU AgCenter and the LSU College of Agriculture