Table 2 Variance analysis of regression models fitting the indices related to phenol, flavonoid, essential oil content and essential oil yield grapefruit mint.

Model

5

11.51^**

5

4.26^**

5

0.57^**

5

0.44^*

X₁(Drought)

1

23.33^**

1

6.02^*

1

0.46^**

1

1.16^**

X₂(Melatonin)

1

11.79^*

1

0.55^ns

1

0.23^*

1

0.68^*

X₁×X₂

1

18.67^*

1

0.00^ns

1

0.02^ns

1

0.01^n.s

X₁²

1

38.04^**

1

17.4^**

1

2.24^**

1

0.87^*

X₂²

1

26.28^**

1

7.48^**

1

0.85^**

1

0.90^*

Residuals

7

1.43

7

0.34

7

0.03

7

0.08

Lack of fit

3

2.05^ns

3

0.63^ns

3

0.07^*

3

0.14^ns

Pure Error

4

0.95

4

0.13

4

0.01

4

0.03

R²

0.85

-

0.89

-

0.91

-

0.79

-

Adjusted R²

0.74

-

0.82

-

0.85

-

0.65

-

Predicted R²

0.18

-

0.29

-

0.41

-

0

-