## 3 Results and Discussion  
### Antioxidant Activity and Vitamin C, Total Polyphenol, Chlorophyll, and Carotenoid Content  
Table 1 presents the vitamin C, total polyphenol, chlorophyll a and b, and carotenoid content, alongside the antioxidant activity (determined as ABTS and DPPH) for fresh white cabbage and after five months of storage. White-head cabbage has moderate vitamin C content but, due to its large share of total vegetable consumption, it constitutes an important source of this vitamin for the body. In this study, the highest vitamin C content was found in cabbage subjected to fertilization with sulfur in the form of potassium sulfate (45.04 mg:100 g\({}^{-1}\) FM), while the lowest content was seen in the control sample (37.84 mg:100 g\({}^{-1}\) FM). A similar vitamin C content was found in a study of different varieties of late white cabbage by [PERSON] and [PERSON] (2011). The highest levels of vitamin C were found in the Galaxy variety (40.9 mg:100 g\({}^{-1}\) FM), and the lowest in the Alfama variety (36.8 mg:100 g\({}^{-1}\) FM). In her literature review, [PERSON] (2012) noted significant differences in the vitamin C levels reported in different studies, ranging from 18.8 to 47.0 mg:100 g\({}^{-1}\) FM. After 5 months of storage, the vitamin C content decreased. The greatest loss (of 35%) was recorded in cabbage grown on the plot treated with potassium sulfate, while the smallest loss (of 8%) was seen in cabbage grown on the plot treated with ammonium sulfate. Research by [PERSON] et al. (2013) revealed a significant loss (of up to 20% of initial content) of vitamin C after 3 months of storage, followed by a further loss of up to 50% after 5 months of storage. In the study by [PERSON] at al. (2014), the measured vitamin C content was higher than that determined in the present study for fresh cabbage, a difference which may be attributed to different weather conditions in the respective research years. However, the chlorophyll a and b and carotenoid contents were similar. As with the vitamin C content, the highest total polyphenol content of was determined in cabbage grown with potassium sulfate as fertilizer, while the lowest was seen in cabbage grown on the plot where ammonium sulfate was used. During storage, there was an increase in the total polyphenol content. The highest increase was found in samples from the plot where elemental sulfur was used, with a change from 65.94 to 75.47 mg:100 g\({}^{-1}\) FM. Statistical calculations revealed that there was no significant difference in the polyphenol content of cabbage from the control plot and from the plot where ammonium sulfate was used. The data collected in a literature review by [PERSON] et al. (2015) demonstrate that the total polyphenol content of white cabbage is highly variable, depending on the extracting agent, the variety under analysis, and the region of origin, i.e., the growing conditions. Chlorophyll content was highest in cabbage grown with potassium sulfate as fertilizer, and carotenoid content was highest in cabbage from plots where ammonium sulfate was used. Hence, we conclude that sulfur fertilization had a positive impact on vitamin C, chlorophyll, and carotenoid contents. [PERSON] et al. (2016) observed that sulfur fertilization induced significant increases in the individual glucosinolate, carotenoid, chlorophyll, and total phenolic contents. The phenolic content of radish sprouts cultivated using 20, 60,