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

Author

Listed:
  • Tomáš Lošák

    (Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic)

  • Tomáš Válka

    (Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic)

  • Jakub Elbl

    (Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
    Agricultural Research, Ltd., Zahradní 1, 664 41 Troubsko, Czech Republic)

  • Antonín Kintl

    (Agricultural Research, Ltd., Zahradní 1, 664 41 Troubsko, Czech Republic)

  • Anna Keutgen

    (University of Natural Resources and Life Sciences Vienna (BOKU), Gregor-Mendel-Str. 33, 1180 Vienna, Austria)

  • Norbert Keutgen

    (University of Natural Resources and Life Sciences Vienna (BOKU), Gregor-Mendel-Str. 33, 1180 Vienna, Austria)

  • Lenka Demková

    (University of Prešov, 17. Novembra 3724/15, 080 01 Prešov, Slovakia)

  • Július Árvay

    (Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia)

  • Ladislav Varga

    (Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia)

  • Hana Hnátková

    (Research and Breeding Institute of Pomology Holovousy Ltd., Holovousy 129, 508 01 Hořice, Czech Republic)

  • Krzysztof Gondek

    (University of Agriculture in Krakow, al. A. Mickiewicza 21, 31-120 Kraków, Poland)

  • Monika Mierzwa-Hersztek

    (University of Agriculture in Krakow, al. A. Mickiewicza 21, 31-120 Kraków, Poland)

Abstract

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 NO 3 − /kg FM , respectively). Following the application of digestate (treatment 2), the content of nitrates (mg NO 3 − /kg FM ) 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 NO 3 − /kg FM (2014) and to 449–468 mg NO 3 − /kg FM (2015). The content of ascorbic acid did not statistically differ among the four treatments in the two years (268–281 and 311–329 mg/kg FM 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.

Suggested Citation

  • Tomáš Lošák & Tomáš Válka & Jakub Elbl & Antonín Kintl & Anna Keutgen & Norbert Keutgen & Lenka Demková & Július Árvay & Ladislav Varga & Hana Hnátková & Krzysztof Gondek & Monika Mierzwa-Hersztek, 2020. "Fertilization with Magnesium- and Sulfur-Supplemented Digestate Increases the Yield and Quality of Kohlrabi," Sustainability, MDPI, vol. 12(14), pages 1-11, July.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:14:p:5733-:d:385562
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