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Factors and levels of response surface central composite design.
| Symbol | Variables | Code level | ||||
| −1.6828 | −1 | 0 | 1 | 1.6818 | ||
| A | Rice (g/l) | 58.4489 | 60.75 | 64.125 | 67.50 | 69.8011 |
| B | NaNO3 (g/l) | 0.1755 | 0.23 | 0.31 | 0.39 | 0.44459 |
| C | K2HPO4 · 3H2O (g/l) | 0.2389 | 0.29 | 0.365 | 0.44 | 0.49119 |
