Table 2 Calibration and validation statistics of partial least square regression (PLSR) models based on the entire full wavelengths (350–2500 nm) for estimating shoot dry weight per square meter (SDW), net photosynthesis rate (Pn), stomatal conductance (Gs), and transpiration rate (E)) under each season (n = 18), salinity level (n = 12), and cultivar (n = 18) individually and all pooled data (n = 36). The abbreviations Treatm. and Par. indicate treatments and parameters, respectively.

From: Estimating growth and photosynthetic properties of wheat grown in simulated saline field conditions using hyperspectral reflectance sensing and multivariate analysis

Treatm.

Par.

ONLVs

Calibration dataset

Validation dataset

R²

RMSE.

RE (%)

R²

RMSE.

RE (%)

Pooled data

SDW

4

0.82***

181.47

13.06

0.82***

173.54

12.48

P n

4

0.79***

1.93

14.75

0.79***

2.040

15.59

Gs

4

0.81***

29.67

17.12

0.80***

28.11

16.22

E

3

0.53***

0.455

14.51

0.53**

0.406

12.95

1st Season

SDW

3

0.86***

164.52

11.13

0.86***

170.32

11.52

P n

3

0.85***

1.719

12.47

0.90***

1.495

10.84

Gs

3

0.83***

27.61

15.55

0.81***

29.72

16.73

E

1

0.30*

0.503

14.85

0.43*

0.430

12.70

2nd Season

SDW

3

0.79***

177.97

13.67

0.80***

168.95

12.98

P n

1

0.60**

2.384

19.26

0.58**

2.296

18.55

Gs

4

0.84***

27.61

16.34

0.85***

27.89

16.51

E

3

0.58**

0.409

14.18

0.53**

0.408

14.14

Control

SDW

3

0.81***

73.72

3.85

0.85***

62.75

3.28

P n

2

0.72**

1.625

9.21

0.70***

1.602

9.08

Gs

2

0.44*

17.25

6.59

0.55**

17.23

6.58

E

3

0.76***

0.176

4.56

0.78***

0.167

4.33

60 mM NaCl

SDW

1

0.64**

115.97

9.14

0.63**

128.03

10.10

P n

3

0.90***

0.733

6.04

0.94***

0.514

4.24

Gs

1

0.59**

18.21

12.71

0.62**

18.877

13.18

E

3

0.80***

0.138

4.47

0.95***

0.077

2.49

120 mM NaCl

SDW

1

0.58**

89.61

9.07

0.62**

85.03

8.61

P n

3

0.76***

0.822

8.68

0.74***

0.952

10.06

Gs

2

0.53**

9.64

8.40

0.54*

9.87

8.60

E

1

0.55**

0.223

9.07

0.66**

0.205

8.34

Sakha 93

SDW

3

0.84***

157.71

10.39

0.90***

124.98

8.23

P n

3

0.86***

1.530

10.09

0.86***

1.393

9.19

Gs

4

0.88***

22.73

11.91

0.87***

22.95

12.02

E

2

0.78***

0.302

10.07

0.78***

0.250

8.33

Sakha 61

SDW

4

0.88***

144.14

11.42

0.92***

104.8

8.31

P n

1

0.70***

1.728

15.69

0.65**

1.915

17.39

Gs

4

0.92***

18.131

11.64

0.91***

19.044

12.23

E

1

0.67**

0.378

11.56

0.71***

0.380

11.52

  1. *,**,***Significant at the 0.05,0 0.01, and 0.001 probability levels, respectively, and ns: not significant.
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