Table 2 Interannual comparison of total anthraquinone in different experimental sites (%/plant)

2

1.99 ± 0.12b

1.53 ± 0.10d

1.72 ± 0.09c

1.1 ± 0.04c

0.82 ± 0.07c

3

3.28 ± 0.34ab

2.5 ± 0.15c

3.29 ± 0.26bc

2.47 ± 0.16bc

2.01 ± 0.22b

4

4.06 ± 0.21a

3.29 ± 0.13b

4.39 ± 0.14ab

2.85 ± 0.09ab

2.39 ± 0.11b

5

4.19 ± 0.14a

4.26 ± 0.24a

5.15 ± 0.15a

3.97 ± 0.21a

3.52 ± 0.15a