Table 4 Plackett–Burman experimental results.

From: Calibration of soil contact parameters for planting sand shrubs in the desert regions of Inner Mongolia

Source of variance

Mean squares

Degree of freedom

Sum of square

Ratio of F

P value

Model

789.07

6

131.51

22.40

0.0018

N1

0.0817

1

0.0817

0.0139

0.9107

N2

63.34

1

63.34

10.79

0.0218

N3

650.77

1

650.77

110.83

0.0001

N4

0.0252

1

0.0252

0.0043

0.9503

N5

42.15

1

42.15

7.18

0.0439

N6

32.70

1

32.70

5.57

0.0648

Residual

29.36

5

5.87

  

Cor total

818.43

11

   
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