NPK fertilizers are complex highly efficient combined fertilizers with contents of the main macro-nutritional elements nitrogen, phosphorus and potassium. Advantage of the combined fertilizers is the contents of micro-nutritional elements and there are contents of sulphur in some of them. The fact that all the needed nutritional elements needed by the plant in the initial phases of its development are collected in one granule makes the NPK fertilizers very productive.
Applied in an appropriate programme for balanced fertilization with a view to the requirements of the specific crop, the type of soil and the microclimate of the area, the complex fertilizers have the following advantages:
| Composition | Standards and norms |
|---|---|
| NPK 15:15:15 + 10S | |
| Total nitrogen | 15,0 ± 0,7 |
| Ammonium nitrogen | min. 14,0% |
| Total phosphorus (as P₂O₅) | 15,0 ± 0,7 |
| Water- and citrate-soluble P₂O₅ | min. 14,0% |
| Water soluble phosphorus (as P₂O₅) | min. 13,0% |
| Water soluble potassium (as K₂O) | 15,0 ± 0,7 |
| Moisture | min. 10,0% |
| Moisture | max. 2,0% |
| Granules from 1 to 5 mm | min. 98,0% |
It satisfies the requirements of Regulation 2003/2003 for EU fertilizers