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Range of different factors investigated with Plackett-Burman design.
| Symbol | Variables | Experimental value | |
|---|---|---|---|
| Low (−1) | High (+1) | ||
| X1 | Rice (g/l) | 27 | 33.75 |
| X2 | Wheat (g/l) | 13 | 16.25 |
| X3 | Virtual 1 | −1 | 1 |
| X4 | NaNO3 (g/l) | 1 | 1.25 |
| X5 | CaCO3 (g/l) | 1 | 1.25 |
| X6 | Virtual 2 | −1 | 1 |
| X7 | K2HPO4 · 3H.O (g/l) | 1 | 1 .25 |
| X8 | Virtual 3 | −1 | 1 |
