Variable responses

Source

SS

MS

F value

Pr > F

Plant height (cm)

Linear

13872

23.43

<0.0001

Quadratic

1894

3.20

0.0415

Cross-product

1204

4.07

0.0441

Total model

16970

11.47

<0.0001

Lack of fit

19635

654.51

0.85

0.49

Pure error

138137

274.63

Stem diameter (mm)

Linear

39.70

21.10

<0.0001

Quadratic

22.19

11.80

<0.0001

Cross-product

1.18

1.26

0.0480

Total model

63.07

13.41

<0.0001

Lack of fit

22.61

0.75

0.79

0.78

Pure error

478.85

0.95

Chlorophyll content (SPAD)

Linear

208.94

2.78

0.0062

Quadratic

393.78

5.24

0.0056

Cross-product

106.95

2.85

0.0092

Total model

709.67

3.78

0.0023

Lack of fit

3732

124.42

0.84

0.51

Pure error

16258

32.39