## 3 Results and Discussion
### Determination of Antioxidant Activity and Quantification of Total Phenolic Content  
The irrigation treatment did not have a significant (\(p<0.05\)) effect on antioxidant activity (AA) as determined by the two methods used (ABTS\({}^{+}\) and DPPH\({}^{\bullet}\)) (Table 3); however, the antioxidant activity was significantly (\(p<0.05\)) higher for the samples from the 2019 season compared to those determined in the samples from the 2018 season. However, the total phenolic content (TPC) was significantly (\(p<0.05\)) affected by both factors, the season and the irrigation treatment, with the trees included in the treatments with deficit irrigation (T\({}_{1}\)-T\({}_{3}\)) showing significantly higher values than those observed in oil samples obtained from the control trees (T\({}_{0}\)), and the samples from 2018 had higher values than those from the 2019 season. This experimental positive finding on polyphenol content was possibly due to climatologic conditions. \begin{table}
\begin{tabular}{l c c c c c c} \hline \hline \multirow{2}{*}{**Factor**} & **Peroxide Index** & **Acidity Index** & **K\({}_{232}\)** & **K\({}_{270}\)** & **\(\Delta\)k** & **Commercial Classification** \\  & **(meq O\({}_{2}\) kg\({}^{-1}\))** & **(\% Olele Acid)** & **K\({}_{232}\)** & **K\({}_{270}\)** & **\(\Delta\)k** & **Commercial Classification** \\ \hline \hline \multicolumn{8}{c}{**ANOVA \({}^{\dagger}\)**} \\ \hline Season & *** & n.s. & n.s. & *** & n.s. & \\ Irrigation & *** & *** & ** & n.s. & n.s. & \\ Season \(\times\) Irrigation & *** & *** & n.s. & *** & n.s. & \\ \hline \multicolumn{8}{c}{**Tukey Multiple Range Test \({}^{\ddagger}\)**} \\ \hline Season & & & & & \\  2018 & 8.21 b & 0.240 & 1.80 & 0.086 b & 0.004 & EVOO \({}^{\ddagger}\) \\
2019 & 12.0 a & 0.214 & 1.76 & 0.127 a & 0.002 & EVOO \\ Irrigation & & & & & & \\ T\({}_{0}\) & 12.6 a & 0.317 a & 2.00 a & 0.101 & 0.002 & EVOO \\ T\({}_{1}\) & 9.73 b & 0.207 b & 1.78 ab & 0.101 & 0.004 & EVOO \\ T\({}_{2}\) & 8.74 b & 0.192 b & 1.66 b & 0.111 & 0.004 & EVOO \\ T\({}_{3}\) & 9.34 b & 0.191 b & 1.69 ab & 0.113 & 0.002 & EVOO \\ Season \(\times\) Irrigation & & & & & & \\  2018 \(\times\) T\({}_{0}\) & 11.8 ab & 0.417 a & 1.96 & 0.082 c & 0.004 & EVOO \\
2018 \(\times\) T\({}_{1}\) & 8.15 bc & 0.206 b & 1.96 & 0.086 bc & 0.003 & EVOO \\
2018 \(\times\) T\({}_{2}\) & 5.87 c & 0.187 b & 1.57 & 0.088 bc & 0.004 & EVOO \\
2018 \(\times\) T\({}_{3}\) & 7.02 bc & 0.150 b & 1.72 & 0.089 bc & 0.004 & EVOO \\
2019 \(\times\) T\({}_{0}\) & 13.4 a & 0.218 b & 2.04 & 0.120 ab & 0.001 & EVOO \\
2019 \(\times\) T\({}_{1}\) & 11.3 ab & 0.208 b & 1.61 & 0.116 abc & 0.004 & EVOO \\
2019 \(\times\) T\({}_{2}\) & 11.6 ab & 0.197 b & 1.75 & 0.134 a & 0.004 & EVOO \\
2019 \(\times\) T\({}_{3}\) & 11.7 ab & 0.232 b & 1.66 & 0.137 a & 0.000 & EVOO \\ \hline \hline \end{tabular}  
* n.s.= not significant at \(p>0.05\), ** and *** significant at \(p<0.01\) and \(p<0.005\); \({}^{\ddagger}\) Values followed by the same letter, within the same column and factor, were not significantly different (\(p>0.05\)), according to [PERSON]’s least significant difference test. \({}^{\ddagger}\) EVOO = Extra Virgin Olive Oil.  
\end{table} 
Table 2: Quality parameters of ‘Arbequina’ olive oil samples, obtained from a super-high-density olive tree orchard, according to the requirements of the International Olive Council [27]. [PERSON] et al. [30] observed increases in the antioxidant activity of 218.1% and 153.4% when irrigation water was supplied at 20% and 15% of control water dose, respectively. A similar trend to that described for the AA can be observed in the current study but for TPC; this way, the two treatments following the confederation restrictions (T\({}_{2}\) and T\({}_{3}\)) reached values of 92.9 and 98.5 mg GAE L\({}^{-1}\) compared to 53.7 mg GAE L\({}^{-1}\) found for the control oil (Table 3). Those TPC values were lower than those reported in previous studies [25; 31]. On the other hand, [PERSON] et al.