Treatment

Soaking time (minutes)

1

3

5

Control

5.75a

4.56b

3.77b

9:1 H2SO4

0.80def

0.00ef

0.60d-f

7:3 H2SO4

1.59cd

0.20d-f

2.58c

1:1 H2SO4

0.60d-f

0.99de

0.20d-f

4:6 H2SO4

3.97b

0.99de

2.78c

3:7 H2SO4

3.97b

0.79d-f

1.00de

2:8 H2SO4

1.59cd

0.40d-f

0.99de

1:9 H2SO4

2.38c

1.00 de

1.59cd

SE (±) 0.46