Acta Univ. Agric. Silvic. Mendelianae Brun. 2014, 62(1), 161-166 | DOI: 10.11118/actaun201462010161

The Influence of Digestate and Mineral Fertilisers on Yields and Content of Nitrates and Ascorbic Acid in Kohlrabi Bulbs

Tomáš Lošák1, Tereza Zlámalová1, Monika Vítězová1, Jaroslav Hlušek1, Petr Škarpa1, Jiří Fryč2, Tomáš Vítěz2, Jan Mareček2
1 Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
2 Department of Agriculture, Food and Environmental Engineering, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic

In a one-year vegetation pot experiment we compared the effect of the digestate from a biogas plant and mineral fertilisers on yield and quality parameters of kohlrabi, variety Moravia. Four treatments were used in the trial: 1) untreated control, 2) urea, 3) digestate, 4) urea, triple super phosphate, KCl, MgSO4. The rate of N was the same in treatments 2-4, i.e. 1.5 g N/pot. In treatment 4 the rate of P, K and Mg corresponded with the rate of these nutrients in the digestate treatment (3).
The inhibited growth of kohlrabi after the application of NPKMg (4) was obviously the consequence of early planting after the application of fertilisers (5 days) and of the salinity of the small content of soil in the pot and resulted in the lowest weight of single bulbs (69 g), followed by the unfertilised control treatment (75 g). After the application of the digestate (treatment 3) the weight of single bulbs significantly increased (126 g) compared to the urea treatment (101 g) and all the other treatments. The content of ascorbic acid in the fertilised treatments did not differ (441-458 mg/kg) but it increased significantly compared to the unfertilised treatment (398 mg/kg). There were significant differences among all the fertilised treatments (1-2-3-4) in the bulb nitrate content (346-1,147-815-1,091 mg NO3-/kg fresh matter, respectively). After digestate application their content decreased significantly to 815 mg NO3-/kg fresh matter. Digestate treatment resulted in comparable or better yields and qualitative parameters compared to all the other treatments.

Keywords: digestate, urea, mineral fertilisers, kohlrabi, yields, ascorbic acid, nitrates
Grants and funding:

The study was financed by the Internal Grant Agency of the Faculty of Agronomy MENDELU in Brno No. TP 11/2013.

Prepublished online: April 22, 2014; Published: February 1, 2014  Show citation

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Lošák, T., Zlámalová, T., Vítězová, M., Hlušek, J., Škarpa, P., Fryč, J., Vítěz, T., & Mareček, J. (2014). The Influence of Digestate and Mineral Fertilisers on Yields and Content of Nitrates and Ascorbic Acid in Kohlrabi Bulbs. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 62(1), 161-166. doi: 10.11118/actaun201462010161
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