Coefficient

Estimate

Standard Error

t

P-value

Model 1 (Without Organic Matter): PR = 1.97*θs^−0.23*ρs^1.51 ( $R_{aj}^2$ = 0.71; F > Fsig.)

a

0.725270

0.03497654

20.7361

0.000000

b

−0.205029

0.02115799

−9.6904

0.000000

c

1.488736

0.06225204

23.91465

0.000000

Model 2 (With Organic Matter): PR’ = 1.56*θs^−0.19*ρs^1.11*Ωs^0.14 ( $R_{aj}^2$ = 0.90; F > Fsig.)

a

0.261447

0.046913864

05.5730

0.000000

b

−0.284545

0.018364237

−15.4945

0.000000

c

1.254871

0.054029591

23.2256

0.000000

d

0.149589

0.012028303

12.4364

0.000000