Table 2 Estimated coefficients and P -values for the response surface models

Xylose

2.876 × 10^-6

Coef.

3.521

-0.017

0.038

-9.56 × 10^-3

-

-

-

P-value^b

1.13 × 10^-6

1.71 × 10^-6

5.57 × 10^-5

0.125

-

-

-

Arabinose

3.589 × 10^-6

Coef.

0.217

-3.12 × 10^-4

0.423

9.97 × 10^-3

-2.13 × 10^-3

-

-

P-value

0.701

0.919

5.83 × 10^-4

0.038

1.01 × 10^-3

-

-

Phosphorus

8.009 × 10^-5

Coef.

1.331

-6.47 × 10^-3

0.058

0.010

-

-

-

P-value

0.014

0.019

1.55 × 10^-5

0.213

-

-

-

Magnesium

2.165 × 10^-5

Coef.

-0.908

3.47 × 10^-3

0.467

0.017

-1.92 × 10^-3

-

4.13 × 10^-3

P-value

0.130

0.249

4.25 × 10^-4

0.098

4.22 × 10^-4

-

0.017

Calcium

3.33 × 10^-4

Coef.

-0.869

1.25 × 10^-3

0.488

0.035

-1.66 × 10^-3

-

-7.21 × 10^-3

P-value

0.396

0.810

0.010

0.064

0.060

-

0.019

Potassium

1.801 × 10^-4

Coef.

2.51 × 10^-2

-2.38 × 10^-4

5.36 × 10^-2

3.25 × 10^-3

-2.15 × 10^-4

-

-5.99 × 10^-4

P-value

0.782

0.615

3.65 × 10^-3

0.059

0.014

-

0.028

Zinc

1.594 × 10^-3

Coef.

1.683

-7.36 × 10^-3

0.052

6.67 × 10^-3

-

-

-

P-value

0.018

0.037

3.97 × 10^-4

0.519

-

-

-

Manganese

4.552 × 10^-4

Coef.

1.481

-0.011

0.187

0.029

-

-

6.654 × 10^-3

P-value

0.065

6.32 × 10^-3

0.018

0.245

-

-

0.092