## 3 Results
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Treatment** & **Cultivar** & \multicolumn{3}{c}{**Harvest Date the Number of Days after Sowing**} & \multicolumn{1}{c}{**Means for Cultivar**} \\ \hline  & Warta & 0.83 \(\pm\) 0.41 a & 0.82 \(\pm\) 0.44 a & 1.37 \(\pm\) 0.56 b & 1.01 \(\pm\) 0.50 A \\  & Bamberka & 1.35 \(\pm\) 0.09 b & 1.19 \(\pm\) 0.24 ab & 2.77 \(\pm\) 0.44 c & 1.77 \(\pm\) 0.79 B \\  & Borowska & 1.56 \(\pm\) 0.09 b & 1.37 \(\pm\) 0.05 b & 2.76 \(\pm\) 0.17 c & 1.90 \(\pm\) 0.65 B \\ \cline{2-6}  & Means for harvest time & 1.25 \(\pm\) 0.39 A & 1.13 \(\pm\) 0.35 A & 2.30 \(\pm\) 0.79 B & \\ \hline  & Warta & 46.69 \(\pm\) 1.37 a & 49.50 \(\pm\) 1.24 b & 57.34 \(\pm\) 0.79 ef & 51.18 \(\pm\) 4.82 A \\  & Bamberka & 59.06 \(\pm\) 0.54 fg & 51.87 \(\pm\) 1.43 c & 60.12 \(\pm\) 0.89 g & 57.02 \(\pm\) 3.94 C \\  & Borowska & 46.66 \(\pm\) 1.57 a & 56.82 \(\pm\) 1.68 e & 53.90 \(\pm\) 1.94 d & 52.46 \(\pm\) 4.73 B \\ \cline{2-6}  & Means for harvest time & 50.81 \(\pm\) 6.20 A & 52.73 \(\pm\) 3.45 B & 57.12 \(\pm\) 2.91 C & \\ \hline  & Warta & 16.20 \(\pm\) 0.24 ef & 14.87 \(\pm\) 0.32 d & 11.76 \(\pm\) 0.51 a & 14.28 \(\pm\) 1.97 A \\ Ash & Bamberka & 16.63 \(\pm\) 0.06 f & 13.66 \(\pm\) 0.68 c & 12.72 \(\pm\) 0.40 b & 14.34 \(\pm\) 1.79 A \\  & Borowska & 17.96 \(\pm\) 0.53 g & 15.69 \(\pm\) 0.18 e & 11.95 \(\pm\) 0.41 a & 15.20 \(\pm\) 2.62 B \\ \cline{2-6}  & Means for harvest time & 16.93 \(\pm\) 0.84 C & 14.74 \(\pm\) 0.96 B & 12.14 \(\pm\) 0.59 A & \\ \hline  & & & & & \\ \end{tabular}  
* FM—fresh mass; results are expressed as mean \(\pm\) SD; n = 4; mean values with different letters (a–g) within the individual rows and columns (without last column) are statistically different \(p\leq\) 0.05; mean values with capital letter (A–C) within last column (for cultivar) or rows (for harvest time) are statistically different at \(p\leq\) 0.05.  
\end{table} 
Table 1: _Cont._Based on the results of antioxidant activity measured with the ABTS and FRAP methods, it can be confirmed that white mustard plants obtained the highest results after the 38 days of sowing, with the exception of the Warta cultivar (Table 2). After the 45 day of sowing, the antioxidant activity measured with the ABTS method decreased by about 21%, compared to the 38 days after sowing, while with FRAP it was by about 29%. On the other hand, white mustard plants harvested after 31 days of sowing were characterized by lower antioxidant activity, measured with the methods mentioned above, as compared to the plants harvested after 38 days of sowing (ABTS 13% and FRAP 18% lower). Differences between the tested mustard cultivars in terms of antioxidant activity were also found. In the ABTS method, the maximum values were obtained for the Bamberka cultivar, and in the FRAP method, the Borowska cultivar (Table 2). Similar relationships were also observed for the content of polyphenols. The maximum content of polyphenols was measured after 38 days of sowing and it was, on average, 8247 mg/100 g. In the third harvest (45 days after sowing), the polyphenols content decreased by about 18% and in the first by about 7%, compared to the second harvest. In terms of polyphenol content, the Bamberka cultivar (8135 mg/100 g) came first. In HPLC analysis, there were 20 polyphenolic compounds identified, which are presented in Table 3. The exceptions were cultivar Bamberka (not detected: caffeic acid) and cultivar Warta (not detected: gallic acid). Comparing the content of total polyphenols in samples collected at specified dates, the cultivar Warta was characterized by the significantly lowest, however the cultivar Borowska by the significantly highest content of total polyphenols, at all three harvest times. Based on the results in Table 3 it can be suggested that in all samples, the dominant compound was rutin. However in Figures 1-3 the highest peaks are shown. These peaks are probably for luteolin-7-O-glucoside, apigenin-7-O-glucoside apigenin-7-O-glucuronide.