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Ranges of the independent variables used in RSM.
| Variable | Levels (mg/g dry substrate) | |||||
|---|---|---|---|---|---|---|
| Code | −2 | −1 | 0 | +1 | +2 | |
| NH4NO3 | X1 | 5.0 | 6.2 | 7.5 | 8.7 | 10.0 |
| MnSO4·7H2O | X2 | 10.0 | 20.0 | 30.0 | 40.0 | 50.0 |
| Soya bean cake | X3 | 40.0 | 50.0 | 60.0 | 70.0 | 80.0 |
| K2HPO4 | X4 | 2.0 | 3.2 | 4.5 | 5.7 | 7.0 |
