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Levels of various Carbon and Nitrogen sources tested in Plackett-Burman Design (PBD).
| Variables code | Independent Variables | Levels (g/l) | |
|---|---|---|---|
| Low level −1 | High level +1 | ||
| x1 | Glucose | 15 | 60 |
| x2 | Dextrose | 15 | 60 |
| x3 | Lactose | 15 | 60 |
| x4 | Karanja | 10 | 40 |
| x5 | Jatropha | 12 | 48 |
| x6 | Neem | 12 | 48 |
| x7 | Mahua | 17 | 56 |
