Table 2 Actual and coded levels of the studied factors (incubation time and phosphorus level).
Run No. | Actual levels of factors | Coded levels of factors | Run Type | ||
|---|---|---|---|---|---|
Time | PL | x1 | x2 | ||
1 | 14 | 1000 | −1 | −1 | Factorial |
3 | 14 | 4000 | −1 | 1 | Factorial |
6 | 90 | 1000 | 1 | −1 | Factorial |
8 | 90 | 4000 | 1 | 1 | Factorial |
2 | 14 | 2500 | −1 | 0 | Axial |
4 | 52 | 1000 | 0 | −1 | Axial |
5 | 52 | 4000 | 0 | 1 | Axial |
7 | 90 | 2500 | 1 | 0 | Axial |
9 | 52 | 2500 | 0 | 0 | Center |
10 | 52 | 2500 | 0 | 0 | Center |
11 | 52 | 2500 | 0 | 0 | Center |
