## 3 Results and Discussion
### Summary of 5-Year Observation
\begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline  & & \multicolumn{6}{c}{**Air Temperature, \({}^{\circ}\)C**} \\  & **IV** & **V** & **VI** & **VII** & **VIII** & **IX** & **X** & **Mean fromIV to X \({}^{\circ}\)C** \\ \hline
**2016** & 9.5 & 14.7 & 19.1 & 19.4 & 17.8 & 15.6 & 7.3 & 14.8 \\
**2017** & 7.6 & 14.1 & 18.7 & 18.7 & 19.6 & 13.3 & 9.0 & 14.4 \\
**2018** & 14.0 & 17.6 & 19.2 & 20.5 & 20.4 & 15.7 & 9.8 & 16.7 \\
**2019** & 10.0 & 13.3 & 22.6 & 19.2 & 20.4 & 14.5 & 10.4 & 15.8 \\
**2020** & 9.5 & 11.9 & 18.6 & 19.3 & 20.5 & 15.3 & 9.9 & 15.0 \\
**Averagetemperature** & 10.1 & 14.3 & 19.6 & 19.4 & 19.7 & 14.9 & 9.3 & 15.3 \\
**Mean (1988–2008)** & 8.8 & 14.2 & 16.9 & 19.1 & 18.4 & 13.4 & 8.6 & 14.2 \\ \hline \hline \multicolumn{10}{c}{**Total precipitation, mm**} \\  & **IV** & **V** & **VI** & **VII** & **VIII** & **IX** & **X** & \(\sum\) precipitation** \\ \hline
**2016** & 22.4 & 38.0 & 21.0 & 55.2 & 47.4 & 17.2 & 36.6 & 237.8 \\
**2017** & 80.6 & 49.6 & 31.4 & 26.6 & 44.2 & 77.0 & 72.4 & 381.8 \\
**2018** & 15.4 & 45.2 & 40.4 & 86.6 & 66.2 & 38.4 & 33.4 & 325.6 \\
**2019** & 42.2 & 59.6 & 14.4 & 36.4 & 51.4 & 45.6 & 35.0 & 284.6 \\
**2020** & 11.0 & 54.6 & 64.2 & 44.0 & 43.8 & 58.2 & 78.2 & 354.0 \\
**Averageprecipitation** & 34.3 & 49.4 & 34.3 & 49.8 & 50.6 & 47.3 & 51.1 & 316.8 \\
**Mean (1988–2008)** & 45.7 & 57.0 & 68.7 & 82.4 & 58.7 & 57.0 & 37.9 & 361.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Average monthly air temperatures and total precipitation according to the Agrometeological Station in Pechów during the months of April to October in 2016–2020 (Hortic ProCam). parameters of Round Seedless grapevines. On average, significantly higher weight was achieved by clusters of vines grafted on 110R than on Rup, Du Lot, and 1616C. Significantly larger berries were obtained from vines grafted on 110R than on the others. Similar effects of rootstock type on grapevine yield and properties were shown by [30; 49; 50]. The number of berries per cluster ranged from 75.66 to 88.27 and differed significantly between the assessed rootstock types (Table 2). Shrubs grafted on SO4 rootstock were characterized by clusters with the highest number of berries, while in the case of shrubs on 161-49C and 5 BB this relationship was reversed. The years of the study had a significant effect on the degree of filling of clusters with berries. In 2018, regardless of the type of rootstock used, the clusters of the studied grape variety produced the most berries, significantly, while in 2020 the least, significantly. A significant effect of rootstock type on the number in a cluster was also demonstrated by [34], in the case of the Gewurztraminer cultivar, who found that bushes on SO4 rootstock produced significantly more berries than on 5 BB. The authors mentioned above observed that the number of berries in clusters from own-rooted bushes and those grafted on SO4 rootstocks did not differ significantly in the case of Seyval, Verdelet, and Ortega cultivars, while in Marechal Foch and Gewurztraminer cultivars the bushes on their own roots formed clusters with significantly more berries than those grafted on SO4. [27] demonstrated the lack of significant effect of rootstock type on the examined parameter in shrubs of De Chaunae, Okanagan Riesling, Chardonnay, and Riesling cultivars, while in Cabernet Frane cultivar, they found that rootstocks S04, 5C, and 18-815C tended to produce large clusters with a high number of berries, while own-root shrubs produced small clusters with a lower number of berries. The berry weight of Regent grapevines differed significantly depending on the type of rootstock used: shrubs grafted on 125 AA produced the heaviest berries among the combinations evaluated, significantly, and the lightest on 101-14 Mgt, significantly (Table 2). The analysis showed no significant differences in berry weight between the 161-49 rootstocks, SO4, and own-rooted vines as well as between SORI, 5 BB, SO4, and own-rooted vines, as well as 101-14 Mgt, SORI, and 5 BB.