Table 3.
The effect of the two types of vineyard treatments on phenolic compounds content and antioxidant activity of Feteasca Neagra wines obtained in two vintages representative for the period 2010–2019
| Harvest year | Treatment | Parameters | |||
|---|---|---|---|---|---|
| Total polyphenols (mg L−1) | Total anthocyanins (mg L−1) | Total flavonoids (mg L−1 rutin) | Antioxidant activity(µmoli L−1 Trolox) | ||
| 2013 | Org C | 1293 ± 12b | 484 ± 6c | 90.2 ± 2.0ab | 5986 ± 279b |
| Org CT | 1529 ± 14a | 654 ± 5a | 96.8 ± 2.9a | 7379 ± 168a | |
| Conv C | 1009 ± 12c | 416 ± 6d | 83.2 ± 4.1b | 5028 ± 396c | |
| Conv CT | 1336 ± 13b | 523 ± 10b | 92.8 ± 4.1a | 6458 ± 261b | |
| 2014 | Org C | 849 ± 13c | 333 ± 4b | 85.4 ± 3.4a | 4358 ± 235b |
| Org CT | 943 ± 13a | 408 ± 5a | 94.6 ± 4.6a | 4913 ± 190a | |
| Conv C | 894 ± 16bc | 286 ± 6c | 75.2 ± 5.7a | 4286 ± 178b | |
| Conv CT | 930 ± 15ab | 352 ± 4b | 81.0 ± 6.2a | 4565 ± 211ab | |
| ANOVA | Year (Y) | **** | **** | * | **** |
| Treatment (T) | ns | * | ns | ns | |
| Y x T | **** | **** | ns | **** | |
Org–organic system, Conv–conventional system, CT–30% cluster thinning, C–control; Means (n = 3) ± standard deviation followed by different lowercase letters in the column differ significantly according to the Duncan’s multiple range test (95% confidence) for year (Y), treatment (T) and both, year and treatment (Y × T): ns: p > 0.05 (not significant), *p ≤ 0.05 (significant), **p ≤ 0.01 (highly significant), ***p ≤ 0.001 (very highly significant) and ****p ≤ 0.0001 (extremely significant)