## 3 Results  
### Camelina  
The average Cu content in amelina grown on the control soil was the highest and amounted to 75.5 mg\(\cdot\)kg\({}^{-1}\); the lowest was found for the plant grown on compost-enriched soil (47.5 mg\(\cdot\)kg\({}^{-1}\)), and the addition of fly ash contributed to the amount of Cu in the plants at 52.5 mg\(\cdot\)kg\({}^{-1}\) (Figure 1). According to the data in Table 2, the amount of Cu in amelina grown in the soil enriched with compost differed statistically significantly from the amount of Cu in amelina cultivated in the control soil. Significant differences can also be underlined when comparing the Cu content in plants grown in the soil with FA addition with that in amelina cultivated in the control soil. Moreover, in terms of Cu content in amelina, the use of compost or fly ash resulted in quantitative changes at a similar level (they did not differ statistically significantly). On average (for all the samples), the highest total Cu level was observed in the soil with the addition of fly ash, where it amounted to 243.3 mg\(\cdot\)kg\({}^{-1}\); the lowest mean value was recorded in the control soil at 199.5 mg\(\cdot\)kg\({}^{-1}\), as a result of the application of compost where the total Cu content was 233.4 mg\(\cdot\)kg\({}^{-1}\) (Figure 1). The total Cu content in soil TII was statistically significantly higher than the total content of Cu in T0. Moreover, Cu\({}_{\text{UTOT}}\) in the soil enriched with compost was statistically significantly higher than Cu\({}_{\text{UTOT}}\) in the control soil (Table 2). Additionally, a significantly lower amount of Cu was found in the soil enriched with compost compared to the soil with the addition of fly ash (\(p\)-value = 0.038) (Table 2). The average Cu\({}_{\text{UTPTA}}\) for the control soil was the highest and amounted to 105.9 mg\(\cdot\)kg\({}^{-1}\), the lowest mean bioavailable amount of this metal (86.78 mg\(\cdot\)kg\({}^{-1}\)) was determined in the soil with fly ash addition, whereas for the soil fertilized with compost, the average Cu\({}_{\text{UTPTA}}\) was 92.7 mg\(\cdot\)kg\({}^{-1}\) (Figure 1). Cu\({}_{\text{UTPTA}}\) in the soil enriched with compost was statistically significantly lower in comparison to the data showed for the control soil. Similarly, a significant difference was observed between the bioavailable Cu amount in the control soil and that found for the soil fertilized with fly ash (Table 2). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \multicolumn{1}{c}{} & \\ \hline \multirow{2}{*}{} & \multirow{2}{*}{**Plant**} & **Total** & **Bioavailable** & & & & & & & \\  & **Content** & **Content** & **BCF\({}_{\text{T}}\)** & **BCF\({}_{\text{B}}\)** & **EDI\({}_{\text{W}}\)** & **EDI\({}_{\text{M}}\)** & **HRI\({}_{\text{W}}\)** & **HRI\({}_{\text{M}}\)** \\ \hline T0–TI & \textless{}0.001  
The highest mean amount of Zn in amelina was determined for plants grown in the control soil, where it was 107.4 mg\(\cdot\)kg\({}^{-1}\), and the lowest was in plants grown in the soil fertilized with compost (80.3 mg\(\cdot\)kg\({}^{-1}\)). On the other hand, the addition of fly ash contributed to the average amount in amelina at 84.6 mg\(\cdot\)kg\({}^{-1}\) (Figure 2). The highest mean total Zn content (for all the samples) was recorded for the soil enriched with compost (106.0 mg\(\cdot\)kg\({}^{-1}\)), and the lowest mean total Zn amount was found for the control soil (101.2 mg\(\cdot\)kg\({}^{-1}\)), whereas in soil with the fly ash addition the total Zn content amounted to 104.6 mg\(\cdot\)kg\({}^{-1}\) (Figure 2). The average Zn\({}_{\rm DITPA}\) amount found for the control soil was the highest and amounted to 17.10 mg\(\cdot\)kg\({}^{-1}\).