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Open AccessArticle

Fertilization with Magnesium- and Sulfur-Supplemented Digestate Increases the Yield and Quality of Kohlrabi

1
Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
2
Agricultural Research, Ltd., Zahradní 1, 664 41 Troubsko, Czech Republic
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University of Natural Resources and Life Sciences Vienna (BOKU), Gregor-Mendel-Str. 33, 1180 Vienna, Austria
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University of Prešov, 17. Novembra 3724/15, 080 01 Prešov, Slovakia
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Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia
6
Research and Breeding Institute of Pomology Holovousy Ltd., Holovousy 129, 508 01 Hořice, Czech Republic
7
University of Agriculture in Krakow, al. A. Mickiewicza 21, 31-120 Kraków, Poland
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(14), 5733; https://doi.org/10.3390/su12145733
Received: 15 June 2020 / Revised: 13 July 2020 / Accepted: 14 July 2020 / Published: 16 July 2020
The vegetation pot experiment with kohlrabi (Moravia variety) was established in 2014 and 2015. The experiment included four treatments of fertilization: (1) untreated control, (2) digestate, (3) digestate + Mg + S, and (4) digestate + S. Treatments 2–4 were fertilized with the same N dose. Differences between the years were recorded in all parameters. Compared with the variant with digestate (100%), the kohlrabi yield of the unfertilized variant was demonstrably lower in both years (33.1% and 46.9%). Digestate enriched with the fertilizer containing Mg + S (treatment 3) demonstrably increased the yield of kohlrabi by 10.2% and 15.7% compared with pure digestate (treatment 2). Digestate enriched with the fertilizer containing elementary S (treatment 4) demonstrably increased the yield of kohlrabi (by 7.4%) only in 2015 compared with pure digestate (treatment 2). Except for the year 2015, there were no yield differences between variants 3 and 4. In both years, the lowest content of nitrates in kohlrabi was observed in the unfertilized control (135 and 163 mg NO3/kgFM, respectively). Following the application of digestate (treatment 2), the content of nitrates (mg NO3/kgFM) increased to 327 in 2014 and to 509 in 2015. The addition of fertilizers with Mg + S as well as fertilizer with elementary S to the digestate (treatment 3 and 4) significantly reduced the content of nitrates to 295–301 mg NO3/kgFM (2014) and to 449–468 mg NO3/kgFM (2015). The content of ascorbic acid did not statistically differ among the four treatments in the two years (268–281 and 311–329 mg/kgFM in 2014 and 2015, respectively). Digestate supplemented with Mg + S (magnesium sulfate) or only with elementary S can be recommended for kohlrabi fertilization prior to the planting in order to reduce dangerous accumulations of nitrates in kohlrabi. View Full-Text
Keywords: digestate; magnesium; sulfur; kohlrabi; nitrate N; vitamin C digestate; magnesium; sulfur; kohlrabi; nitrate N; vitamin C
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MDPI and ACS Style

Lošák, T.; Válka, T.; Elbl, J.; Kintl, A.; Keutgen, A.; Keutgen, N.; Demková, L.; Árvay, J.; Varga, L.; Hnátková, H.; Gondek, K.; Mierzwa-Hersztek, M. Fertilization with Magnesium- and Sulfur-Supplemented Digestate Increases the Yield and Quality of Kohlrabi. Sustainability 2020, 12, 5733.

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