Position

Total phenol

Residual phenol

Total tannins

Flavonoids

Base

21.42 b

4.79 a

16.61 b

3.28 a

Middle

17.10 a

4.75 a

12.35 a

2.70 a

Top

23.05 b

4.82 a

18.23 b

3.50 a

Average

20.52

4.79

15.73

3.16