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Independent variables and levels used in the CCD for the phosphate solubilization and IAA production of the isolate.
| Factors | Unit | Coded symbol | Coded Levels |
||||
|---|---|---|---|---|---|---|---|
| -α | -1 | 0 | +1 | +α | |||
| Incubation Temperature | oC | A | 25 | 30 | 35 | 40 | 45 |
| Incubation time | days | B | 3 | 6 | 9 | 12 | 15 |
| pH | - | C | 5 | 6 | 7 | 8 | 9 |
| Inoculum size | OD | D | 1 | 1.5 | 2 | 2.5 | 3 |
