Sulphur fertilization may improve the nutritional value of Brassica rapa L. subsp. sylvestris

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Environmental and agronomic impact of fertilization with composted organic fraction from municipal solid waste: A case study in the region of Naples, Italy (2011, background): “In any case, all the values were much lower than the threshold laid down in the 466/01 European Directive (4500 mg NO3 kg−1 of fresh weight), confirming that vegetable production in the Mediterranean area does not have problems of nitrate accumulation in leaves (De Pascale et al., 2007).”
Nutritional and phytochemical value of Brassica crops from the agri‐food perspective (2017, background): “The application of increased S-fertilisers elevates the total phenolic contents and the antioxidant activity in different Brassica crops such as turnips (De Pascale et al., 2007) and broccoli (Vallejo et al., 2003).”
Phenolic Compounds in Brassica Vegetables (2010, methodology): “Several studies reported that an increase in sulfur fertilization significantly promotes the total phenolic contents and the antioxidant activity in leaf mustard [88], broccoli [89] and ‘friarello’, a local B. rapa crop widely grown in Southern Italy [87].”