## 3 Results and Discussion
In the series without any fluorine-immobilizing substances, a statistically significant decrease in the sodium content was recorded in the aerial parts (\(r=-0.83\)**) and the roots of yellow lupine (\(r=-0.99\)**), in the aerial parts (\(r=-0.79\)**) and roots of winter oilseed rape (\(r=-0.98\)**), in the roots of narrow-leaf lupine (\(r=-0.96\)**), in the aerial parts (\(r=-0.90\)**) and roots of black radish (\(r=-0.88\)**), and in the roots of phacelia (\(r=-0.95\)**). The decreased sodium content in most of the test plants was likely a consequence of fluorine 'entering' a reaction, i.e., the binding of sodium into complexes hardly soluble in water, thus making this element less available to plants. [PERSON] and [PERSON] (2018) also reported a negative correlation between the presence of fluorine in soil and the content of sodium in seedlings of _Camellia sinensis_. An opposite tendency, \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{6}{c}{**Type of Neutralizing Substance**} \\ \cline{2-6}
**Fluorine Dose in** & \multicolumn{2}{c}{**Without**} & & & \\
**mg kg \({}^{-1}\) of Soil** & \multicolumn{2}{c}{**Neutralizing Substance**} & **Lime** & **Charcoal** & **Loam** & **Mean** \\ \hline \hline \multicolumn{6}{c}{Narrow-leaf lupine} \\
0 & 2.8 & 2.6 & 2.6 & 2.4 & 2.6 \\
20 & 2.8 & 2.7 & 2.7 & 2.8 & 2.8 \\
40 & 3.0 & 3.0 & 3.0 & 2.7 & 2.9 \\
60 & 2.8 & 2.7 & 2.7 & 2.7 & 2.8 \\ Mean & 2.8 & 2.8 & 2.8 & 2.7 & - \\ \(r\) & 0.22 & 0.43 & 0.43 & 0.57 \({}^{*}\) & - \\ LSD for: & & & aerial parts a—0.07; b—0.07; a—0.14 & & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: _Cont._ \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{6}{c}{**Type of Neutralizing Substance**} \\ \cline{2-6}
**Fluorine Dose in** & \multicolumn{2}{c}{**Without**} & & & \\
**mg kg \({}^{-1}\) of Soil** & \multicolumn{2}{c}{**Neutralizing Substance**} & **Lime** & **Charcoal** & **Loam** & **Mean** \\ \hline \hline \multicolumn{6}{c}{Pracelia aerial parts} \\
0 & 2.5 & 2.2 & 2.8 & 2.6 & 2.5 \\
100 & 2.4 & 2.1 & 2.5 & 2.4 & 2.3 \\
200 & 2.4 & 2.0 & 2.3 & 2.4 & 2.3 \\
300 & 2.3 & 2.0 & 2.3 & 2.4 & 2.2 \\ Mean & 2.4 & 2.1 & 2.5 & 2.4 & - \\ \(r\) & \(-0.81\)** & \(-0.89\)** & \(-0.83\)** & \(-0.69\)* & - \\ LSD for: & & & aerial parts a—0.05; b—0.05; a—0.11 & & \\ \multicolumn{6}{c}{**Spring trticileta grain} \\
0 & 1.3 & 1.3 & 1.3 & 1.3 & 1.3 \\
100 & 1.4 & 1.5 & 1.6 & 1.4 & 1.5 \\
200 & 1.6 & 1.5 & 1.5 & 1.3 & 1.5 \\
300 & 1.6 & 1.5 & 1.4 & 1.4 & 1.5 \\ Mean & 1.5 & 1.5 & 1.5 & 1.4 & - \\ \(r\) & 0.93** & 0.75** & 0.18 & 0.40 & - \\ LSD for: & & & & seed a—0.03; b—0.03; a—0.07 & & \\ \hline \hline \end{tabular} LSD (least significant difference) for a—F soil contamination; b—neutralizing substance; a b—interaction; *—correlation coefficient (\(r\)) significant for \(p=0.05\); **–correlation coefficient (\(r\)) significant for \(p=0.01\).  
\end{table} 
Table 5: Suphur content in phacelia aerial parts and spring trticiletale seed, in g S kg\({}^{-1}\) DM. that is, a statistically higher content of sodium in response to the growing fluorine soil contamination, was noted in the case of phacelia aerial parts (\(r\) = 0.93 **) and all organs of spring tritticale, i.e., grain (\(r\) = 0.77 **), straw (\(r\) = 0.86 **), and roots (\(r\) = 0.74 **). A positive correlation between fluorine soil pollution and the sodium content in plants was found by [PERSON] [31] in a study on _Lolium multiforium_. In their experiment on _Salicornia brachiata_, [PERSON] and [PERSON] [32] proved that the highest fluorine dose (150 mM NaF) caused a threefold increase in sodium content compared to the control. In this experiment, the highest average sodium content was determined in winter oilseed rape roots, at 9.5 g Na kg\({}^{-1}\) DM, while the lowest was detected in spring tritticale grains at 0.02 g Na kg\({}^{-1}\) DM. A considerable difference in this element content between plant organs was noted in phacelia. The roots of this plant contained as much as 16-fold more sodium than its aerial parts.