Composition of some important fertilizers
Common names | N | P2O5 | K2O | S | MgO |
| Nutrients as % of product | |||||
| Nitrogen fertilizers | |||||
| Ammonia | 82 | 0 | 0 | 0 | 0 |
| Ammonium sulphate | 21 | 0 | 0 | 23 | 0 |
| Ammonium nitrate | 33-34.5 | 0 | 0 | 0 | 0 |
| Calcium ammonium nitrate | 20.4-27 | 0 | 0 | 0 | 0 |
| Urea | 45-46 | 0 | 0 | 0 | 0 |
| Phosphate fertilizers | |||||
| Single superphosphate | 0 | 16-20 | 0 | 12 | 0 |
| Triple superphosphate | 0 | 46 | 0 | 0 | 0 |
| Diammonium phosphate | 18 | 46 | 0 | 0 | 0 |
| Monoammonium phosphate | 11 | 52 | 0 | 0 | 0 |
| Ground rock phosphate | 0 | 20-40 | 0 | 0 | 0 |
| Potash fertilizers | |||||
| Muriate of potash (potassium chloride) | 0 | 0 | 60 | 0 | 0 |
| Sulphate of potash | 0 | 0 | 50 | 18 | 0 |
| Sulphate of potash magnesia | 0 | 0 | 22-30 | 17-22 | 10-11 |
| Magnesium fertilizers | |||||
| Kieserite | 0 | 0 | 0 | 20-22 | 25-27 |
| Epsom salt | 0 | 0 | 0 | 12-13 | 15-16 |
| Complex fertilizers | |||||
| NPK fertilizers | 5-25 | 5-25 | 5-25 | * | * |
| NP fertilizers | 15-25 | 15-25 | 0 | * | 0 |
| NK fertilizers | 13-25 | 0 | 15-46 | * | 0 |
| PK fertilizers | 0 | 7-30 | 10-30 | * | * |