From: Factorial design study of total petroleum contaminated soil treatment using land farming technique
S/No | Input variables | Unit | Lower level | Upper level |
---|---|---|---|---|
1 | pH | Nil | 6 | 10 |
2 | Moisture content | % | 10 | 50 |
3 | Mass of substrate | kg | 0.6 | 1.0 |
4 | Turning rate | Times per week | 1 | 5 |