## 3 Results
### Selected Minerals  
Of all 16 elements examined, potassium was the macronutrient whose content in all the species of the young shoots of rare oilseed plants was the highest and ranged widely from 6780.41 to 11,221.57 mg per 100 g DW (Table 3). The highest statistically significant (\(p\leq 0.05\)) potassium content was in the young nigella shoots from the first harvest, and the lowest was in the safflower shoots from the first harvest, compared to the other examined plants. The Potassium content in the young shoots of amelina at both harvest dates and in nigella at the second harvest date were similar. \begin{table}
\begin{tabular}{c c c c c c c} \hline \multirow{2}{*}{**Compounds**} & \multicolumn{2}{c}{**Young Shoots of Nigella**} & \multicolumn{2}{c}{**Young Shoots of Safflower**} & \multicolumn{2}{c}{**Young Shoots of Camelina**} \\  & \multicolumn{2}{c}{**(_Nigella sativa L_)**} & \multicolumn{2}{c}{**(_Carthamus tinctorius L_)**} & \multicolumn{2}{c}{**(_Camelina sativa L_)**} \\ \cline{2-7}  & **First Harvest * & **Second Harvest * & **First Harvest * & **Second Harvest ** & **First Harvest * & **Second Harvest ** \\ \hline Vitamin C & 29.59 \(\pm\) 1.68 \({}^{\circ}\) & 47.37 \(\pm\) 0.16 \({}^{\circ}\) & 5.28 \(\pm\) 0.09 \({}^{\circ}\) & 5.32 \(\pm\) 0.15 \({}^{\circ}\) & 18.75 \(\pm\) 0.95 \({}^{\circ}\) & 38.99 \(\pm\) 0.53 \({}^{\circ}\) \\ \hline Total carotenoids & 13.60 \(\pm\) 0.71 \({}^{\circ}\) & 18.73 \(\pm\) 2.22 \({}^{\circ}\) & 8.40 \(\pm\) 0.00 \({}^{\circ}\) & 18.66 \(\pm\) 1.27 \({}^{\circ}\) & 13.09 \(\pm\) 2.24 \({}^{\circ}\) & 22.07 \(\pm\) 2.70 \({}^{\circ}\) \\ \hline Total polyphenols [mg CGE/10 g FW] & 45.40 \(\pm\) 0.99 \({}^{\circ}\) & 69.95 \(\pm\) 0.00 \({}^{\circ}\) & 59.17 \(\pm\) 1.53 \({}^{\circ}\) & 65.22 \(\pm\) 1.52 \({}^{\circ}\) & 58.70 \(\pm\) 3.01 \({}^{\circ}\) & 64.95 \(\pm\) 1.14 \({}^{\circ}\) \\ \hline Antioxidant activity [mmol factory/1 g FW] & 1.25 \(\pm\) 0.00 \({}^{\circ}\) & 1.42 \(\pm\) 0.01 \({}^{\circ}\) & 4.32 \(\pm\) 0.06 \({}^{\circ}\) & 4.43 \(\pm\) 0.06 \({}^{\circ}\) & 3.86 \(\pm\) 0.01 \({}^{\circ}\) & 4.10 \(\pm\) 0.01 \({}^{\circ}\) \\ \hline \end{tabular}
\end{table} 
Table 2: Vitamin C, total carotenoids, total polyphenol content (mg 100 g\({}^{-1}\) FW), and antioxidant activity (μmol Trolox 1 g\({}^{-1}\) FW) in young shoots at different stages of vegetation. Calcium, magnesium, and phosphorus were generally present in the lowest statistically significant (\(p\leq 0.05\)) amounts in the young nigella shoots, regardless of the harvest date (Table 3). Calcium contents in the examined plants were between 1566.88 to 3834.06 mg/100 g DW. The highest calcium content was found in the young camelina shoots from the second harvest and these amounts were almost 2.5 times higher compared to that determined in the nigella shoots from the first harvest. Magnesium in the examined young shoots was in the range from 347.72 to 719.54 mg/100 g DW. The lowest content was found in nigella, regardless of the harvest date; the second lowest content was found in amelina; and the highest content was found in safflower. In comparison with the other plants examined, the highest magnesium content was determined in the young safflower shoots from the second harvest. The magnesium content of safflower from the second harvest was as much as two times higher than that of the young nigella shoots from the second harvest. As for phosphorus, its content in the examined plants was between 738.61 and 1255.54 mg/100 g DW. The young camelina shoots from the first harvest contained 70% more of this macronutrient, compared to the nigella shoots from the second harvest. No effect of the harvest date (\(p>0.05\)) was observed on the phosphorus content of the examined young shoots. The content of sodium ranged widely from 82.39 to 275.13 mg/100 g DW. The highest statistically significant amounts (\(p\leq 0.05\)) of this element were found in safflower from the second harvest and were about 3.3 times higher than the amounts detected in amelina from the second harvest.