Table 1.
The content of total polyphenols (by Folin–Ciocalteu method), total flavonoids (by Christ–Müller method), total anthocyanins (by Fulecki and Francis method).
| 2018 | Total Polyphenols mg GAE g−1 D.W. * |
Total Flavonoids mg QE 100 g−1 D.W. ** |
Total Anthocyanins mg CGE 100 g−1 D.W. *** |
|---|---|---|---|
| organic | 2118.19 ± 398.71 B | 1009.20 ± 199.91 B | 815.73 ± 213.26 B |
| conventional | 2726.97 ± 248.95 A | 1342.45 ± 83.82 A | 1024.96 ± 127.47 A |
| p-value | <0.0001 | <0.0001 | <0.0001 |
| Nr 30 | 1684.52 ± 99.14 b | 921.05 ± 74.20 b | 443.04 ± 50.49 b |
| Jolanta | 2341.30 ± 529.02 b | 1040.93 ± 250.90 b | 941.53 ± 221.46 b |
| Indigo | 3241.92 ± 223.59 a | 1565.50 ± 109.52 a | 1376.46 ± 141.60 a |
| p-value | <0.0001 | <0.0001 | <0.0001 |
| 2019 | |||
| organic | 2414.66 ± 395.32 A | 1253.76 ± 190.23 A | 994.22 ± 185.03 A |
| conventional | 2225.32 ± 304.86 B | 1192.57 ± 173.09 B | 860.12 ± 161.17 B |
| p-value | 0.0005 | 0.030 | <0.0001 |
| Nr 30 | 1508.91 ± 60.30 b | 858.65 ± 46.01 b | 538.36 ± 17.01 b |
| Jolanta | 1663.84 ± 71.80 b | 827.43 ± 36.48 b | 583.28 ± 24.09 b |
| Indigo | 3787.22 ± 127.42 a | 1983.41 ± 35.64 a | 1659.86 ± 49.78 a |
| p-value | <0.0001 | <0.0001 | <0.0001 |
* GAE—gallic acid equivalents, ** QE—quercetin equivalents, *** CGE—cyanidin glucoside equivalents. Results express as mg 100 g−1 D.W. (dry weight). Data are presented as the mean ± SE (standard error) with ANOVA p-value. Means in column followed by the same letter are not significantly different at the 5% level of probability (p < 0.05), A,B values for different cultivation system, a,b values for different cultivars.