## 4 Conclusions  
By using different types of rootstocks in grapevine cultivation under the conditions of southeastern Poland, we can influence the yield and overall consumer values of the Regent variety berries. The obtained results may be useful for vine cultivation in the Sandomierska Upland. Several years of observation showed that the vines grafted on 125 AA rootstock yielded the best among the evaluated rootstocks, significantly. They were also characterized by the highest number and weight of grapes and the highest weight of berries. Shrubs grafted on rootstock 161-49 yielded the lowest and were characterized by the lowest number of grapes per shrub, while the fruit extract content of Regent cultivar grafted on rootstock 101-14 was significantly lower among the evaluated ones. The evaluated parameters of yield quantity, berries, consumer values of own-rooted bushes, and those grafted on SO4 rootstock did not differ significantly from each other, except for the extract.  
In the last decade, an increase in weather anomalies has been observed, which can have a key effect on the amplitude that was presented and highlighted in the developed model. However, short extreme weather conditions are highly unpredictable and cannot be included in the models. The proposed model leads to convergent conclusions with statistical analysis of raw experimental data. The 125 AA rootstock was arbitrarily the best for all nine tested scenarios, sometimes sharing the lead with own-root vines. On the other hand, the 161-49 rootstock was the weakest, justified only in the most challenging conditions. Nonetheless, it was mentioned that this conclusion is valid only for the Regent variety. Combinations of other varieties and rootstocks may have different reactions. The model precision was very satisfying. The Mean value of relative errors for all rootstocks and tested parameters was 2.15%. The obtained tools also allow formulating general conclusions about the impact of temperature and rainfall on expected berry yield.  
Conceptualization, K.K. and K.P.; methodology K.P.; formal analysis K.K.; investigation M.K. ([PERSON]); writing--original draft preparation, K.K. and K.P.; supervision. M.K. ([PERSON]). All authors have read and agreed to the published version of the manuscript. This work was financed by a statutory activity for the year 2021 from the Polish Minister of Education and Science.  
Not applicable.  
The data presented in this study are available on request from the corresponding author.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Case** & **Temp.** & **Rainfall** & **Best** & **Yield** & **Worst** & **Yield** \\  & [\({}^{\circ}\)**C**] & **[mm]** & & **[kg/vine]** & & **[kg/vine]** \\ \hline
**1** & High & High & Own root & 9.413 & 161-49C & 2.406 \\
**2** & High & Mid & Own root & 3.617 & 161-49C & 2.578 \\
**3** & High & Low & 125 AA & 13.47 & 161-49C & 5.420 \\
**4** & Mid & High & Own root & 4.469 & 161-49C & 1.841 \\
**5** & Mid & Mid & 125 AA & 1.233 & Own root & 0.8444 \\
**6** & Mid & Low & 125 AA & 5.881 & 161-49C & 2.749 \\
7 & Low & High & 125 AA & 2.727 & 5 BB & 1.273 \\
**8** & Low & Mid & 161-49C & 0.5143 & Own root & 0.01241 \\
**9** & Low & Low & 125 AA & 2.680 & 161-49C & 1.401 \\ \hline \hline \end{tabular}
\end{table}
Table 7: Model-based berry yield predictions for tested scenarios.  
**Acknowledgments:** The authors would like to show their gratitude to the NOBILIS Vineyard (Sandomierz Upland, Swietokrzyskie Voivodeship, Poland) for providing the research material.  
**Conflicts of Interest:** The authors declare no conflict of interest.