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Table 3 Ranges and levels of selected input variables

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