Abstract
Cruciferous vegetables are very popular in latitudes corresponding to central and eastern Europe. They are rich in bioactive compounds such as chlorophylls, carotenoids, and polyphenols. The type and quality of fertilization has a significant impact on their chemical composition. The aim of this study was to determine the impact of specific forms of sulfur fertilization on the chemical properties of white cabbage, and to explore the effect of storage conditions on its bioactive components and antioxidant activity. The research material was the late cultivar of white cabbage ‘Stonehead’, fertilized with a dose of 30 kg S·ha−1, administered in the form of elemental sulfur, ammonium sulfate, and potassium sulfate. Sulfur fertilization had a significant impact on the parameters selected for this study, and the form in which it was applied resulted in different effects on these individual parameters. For all parameters investigated, the effect of sulfur fertilization was detectable. Antioxidant properties, determined as both ABTS and DPPH radical-scavenging activities, were the highest in cabbage harvested from the plot treated with potassium sulfate
Highlights
Sulfur, as an essential macronutrient, plays an important role in plant growth and development [1]
The determination methods were as follows: vitamin C as L-ascorbic acid content was determined according to standard methods [14]; total polyphenol content, calculated as gallic acid, was determined according to the Folin–Ciocalteu method [15] (determination of total polyphenol content was performed in methanol extracts (80% v/v ratio of material to extraction reagent, 1:5)); and determination of chlorophyll and carotenoid content was performed according to the method described by Nawirska-Olszańska et al [16], in which the chlorophyll and carotenoid content is calorimetrically determined by measuring absorbance at the absorbance maximum for these pigments using a Shimadzu UV-160A
The form of sulfur used for fertilization had a significant impact on the parameters investigated in this study
Summary
As an essential macronutrient, plays an important role in plant growth and development [1]. Over the last three decades, continuously declining soil sulfur levels have been reported for many European countries. This is largely due to the reduction in sulfur dioxide emissions from industrial sources, the increasing use of low sulfur fertilizers, and the increasing size of crop yields due to technological advances [4]. Sulfur applied during early stages of development and periods of intense plant growth benefits from combination with other fertilizers, especially nitrogen. When applied as elementary sulfur, oxidization to sulfate by soil microbes is necessary, which takes time.
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