Table 3 Parameter coefficients of eq. (Y = a₀ + a₁x₁ + a₂x₂ + a₃x₃ + a₄x₁x₂ + a₅x₁x₃ + a₆x₂x₃ + a₇x₁² + a₈x₂² + a₉x₃²) for plant height (R₁), stem diameter (R₂), root length (R₃), total biomass (R₄), Root-shoot biomass ratio (R₅), leaf water potential (R₆), photosynthesis rate (R₇), transpiration rate (R₈), stomatal conductance (R₉), water use efficiency (R₁₀), chlorophyll a (R₁₁), chlorophyll b (R₁₂), total chlorophyll (R₁₃), malondialdehyde (R₁₄), proline (R₁₅), superoxide dismutase activity (R₁₆), catalase activity (R₁₇) and peroxidase activity (R₁₈)

73.35

11.12

1.63

−1.57

1.88

−3.48

4.75

3.14

−2.20

−2.34

0.990

0.981

0.950

113.09

<  0.0001

2.11

43.42

6.0

0.64

0.16

−0.17

0.07

−0.02

0.06

0.08

− 0.07

− 0.28

0.992

0.985

0.963

147.34

<  0.0001

1.32

46.57

46.77

4.13

0.74

−0.14

0.84

2.21

−2.21

6.41

0.39

1.29

0.980

0.963

0.906

55.99

<  0.0001

2.59

26.90

29.25

5.39

0.58

0.47

0.15

−0.01

−0.07

1.38

0.20

−0.53

0.999

0.998

0.997

1344.44

<  0.0001

0.63

135.78

1.94

−0.17

−0.02

0.001

0.03

0.001

0.05

−0.05

−0.09

− 0.02

0.980

0.963

0.870

56.83

<  0.0001

1.8

24.19

−2.99

1.11

0.21

0.06

−0.01

−0.01

0.04

0.02

0.04

0.08

0.999

0.998

0.998

1725.45

<  0.0001

1.16

156.85

12.43

0.55

0.57

0.11

−0.31

0.22

0.11

− 0.14

− 0.03

0.02

0.984

0.970

0.910

70.70

<  0.0001

1.04

32.12

4.80

0.38

0.16

0.13

0.36

0.38

0.04

−0.14

−0.21

− 0.07

0.987

0.975

0.950

84.14

<  0.0001

1.91

36.77

0.27

0.01

0.008

−0.006

0.004

0.01

0.008

−0.01

−0.02

− 0.02

0.976

0.955

0.917

46.15

<  0.0001

2.86

20.73

2.59

−0.11

0.05

−0.04

− 0.30

−0.19

0.04

0.06

0.13

0.05

0.990

0.981

0.977

111.66

<  0.0001

1.42

43.35

2.56

0.05

0.06

0.008

−0.02

−0.01

0.05

0.02

−0.10

−0.005

0.994

0.990

0.981

213.48

<  0.0001

0.48

62.01

1.95

0.06

0.17

0.0005

−0.03

−0.03

0.14

−0.01

−0.22

− 0.03

0.993

0.987

0.955

167.61

<  0.0001

1.68

46.73

4.51

0.11

0.23

0.008

−0.05

−0.05

0.19

0.007

−0.33

−0.04

0.996

0.993

0.982

325.74

<  0.0001

0.72

69.39

30.29

−2.86

−1.04

−0.42

−1.35

−0.78

2.57

0.939

0.912

0.911

33.75

<  0.0001

3.29

21.55

3.65

−0.46

0.15

−0.35

− 0.20

0.60

− 0.13

− 0.51

0.19

− 0.23

0.963

0.929

0.782

28.79

<  0.0001

6.95

22.08

94.43

−11.07

−4.49

1.06

−3.24

4.84

−2.41

13.29

10.13

9.51

0.985

0.972

0.927

73.19

<  0.0001

2.74

24.82

166.46

−8.59

2.39

−6.39

−1.61

−1.61

6.86

6.16

2.43

1.99

0.963

0.930

0.853

28.85

<  0.0001

1.85

20.05

188.01

−18.75

−14.07

1.21

27.97

−4.79

−13.33

−2.65

−4.77

−5.66

0.993

0.987

0.973

161.49

<  0.0001

1.86

51.97