Table 6 Relationship between drying rate and factors for Radiata pine at different MC levels

Layer-2

− 0.729¹

(2.323)²

− 4.264

(2.910)

2.027

(2.636)

− 0.968

(1.728)

− 0.470

(1.376)

− 0.592

(0.733)

1.040**

(0.388)

Layer-3

0.365

(2.325)

− 0.478

(2.870)

2.200

(2.699)

− 1.500

(2.295)

− 1.667*

(0.969)

− 0.788

(0.691)

0.935**

(0.412)

Layer-4

− 0.775

(2.345)

− 1.339

(3.222)

0.514

(2.767)

− 1.316

(1.715)

− 2.154**

(0.850)

− 1.716**

(0.652)

0.960**

(0.412)

Layer-5

− 1.823

(2.341)

− 4.016

(3.219)

− 0.293

(2.357)

− 1.067

(1.711)

− 3.010***

(0.819)

− 2.117***

(0.714)

0.910*

(0.514)

Layer-6

0.020

(2.333)

− 3.436

(2.770)

0.127

(2.961)

0.348

(2.325)

− 1.689

(1.049)

− 2.590***

(0.780)

0.960

(0.672)

Layer-7

− 2.421

(2.324)

− 8.201***

(2.836)

− 3.536

(2.415)

− 1.790

(1.688)

− 3.604***

(1.180)

− 2.078**

(0.851)

Layer-8

− 2.313

(2.332)

− 7.371***

(2.780)

− 1.964

(1.647)

− 4.026***

(1.005)

− 3.678***

(0.895)

Layer-9

− 2.523

(2.323)

− 4.709

(2.957)

− 2.202

(2.622)

− 4.111**

(1.584)

− 5.356***

(0.978)

− 3.911***

(0.895)

Layer-10

− 5.730**

(2.323)

− 13.648***

(2.850)

− 4.829*

(2.213)

− 5.761***

(1.628)

− 7.015***

(1.178)

MC

0.211***

(0.017)

Drying time

1.624***

(0.417)

4.539***

(0.494)

2.786***

(0.609)

2.452***

(0.371)

2.689***

(0.403)

1.653***

(0.513)

Constant

1.064

(2.426)

20.944***

(2.182)

3.014

(2.003)

0.596

(1.519)

− 1.896

(1.507)

− 0.286

(2.108)

3.740***

(0.275)

Observations

300

161

16

32

35

35

21

R²

0.422

0.421

0.931

0.754

0.790

0.531

0.392

Adjusted R²

0.400

0.383

0.827

0.637

0.702

0.363

0.189

Residual SE

8.996

(df = 288)

8.096

(df = 150)

1.909

(df = 6)

1.874

(df = 21)

1.186

(df = 24)

0.960

(df = 25)

0.614

(df = 15)

F statistic

19.142***

(df = 11; 288)

10.911***

(df = 10; 150)

8.988***

(df = 9; 6)

6.435***

(df = 10; 21)

9.028***

(df = 10; 24)

3.150**

(df = 9; 25)

1.932

(df = 5; 15)