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| Levels | N (kg ha-1) | P2O5(kg ha-1) | K2O(kg ha-1) |
|---|---|---|---|
| Code mark | X1 | X2 | X3 |
| Star on the arms (+1.68) | 52.5 | 26.0 | 83.0 |
| Upper level (+1) | 41.9 | 20.7 | 66.5 |
| Zero level (0) | 26.3 | 13.0 | 41.7 |
| Lower level (-1) | 10.7 | 5.3 | 16.9 |
| Under the arms (-1.68) | 0 | 0 | 0 |
| Change interval | 15.6 | 7.7 | 24.8 |
| Code formula | X1j = (X1-26.3)/15.6 | X2j = (X2-13)/7.7 | X3j = (X-41.7)/24.8 |
