Digestate is equal or a better alternative to mineral fertilization of kohlrabi
Losak, T., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Musilova, L., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Zatloukalova, A., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Szostkova, M., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Hlusek, J., Mendelova Univ., Brno (Czech Republic). Ustav Agrochemie, Pudoznalstvi, Mikrobiologie a Vyzivy Rostlin | Fryc, J., Mendelova Univ., Brno (Czech Republic). Ustav Zemedelske, Potravinarske a Environmentalni Techniky | Vitez, T,, Mendelova Univ., Brno (Czech Republic). Ustav Zemedelske, Potravinarske a Environmentalni Techniky | Haitl, M., Mendelova Univ., Brno (Czech Republic). Ustav Zemedelske, Potravinarske a Environmentalni Techniky | Bennewitz, E., Universidad Catolica del Maule, Curico (Chile). Dept. of Agronomy | Martensson, A., Swedish Univ. of Agricultural Sciences, Uppsala (Sweden). Dept. of Soil and Environment
In a one-year vegetation pot experiment, we compared the effect of digestate from a biogas station and mineral fertilizers on yield and quality characteristics of kohlrabi, variety Segura F1. Four treatments were used in the trial as follows: 1) untreated control, 2) urea, 3) digestate, 4) urea, triple super phosphate, KCl, MgSO4. The N dose was the same in all treatments (1.5 g N/pot). In treatment 4 the P, K and Mg doses corresponded to those supplied in the treatment 3. The weight of single kohlrabi bulbs in the unfertilized control was significantly lower (36.2%) than in the urea treatment (100%) and the other fertilized treatments. When using treatments 3 and 4, the weight of single bulbs significantly increased (by 36.2 and 33.6%, respectively) in comparison with the treatment 2. The level of ascorbic acid did not differ between the fertilized treatments (282-301 mg/kg), but was significantly lower than in the unfertilized control (334 mg/kg). There were significant differences between all fertilized treatments in bulb nitrate concentration (745, 187, 462 mg NO3-/kg fresh matter, respectively). The soil Nmin concentration after harvest varied between 4.19-5.79 mg/kg in all fertilized treatments and the N-NH4+ form prevailed over N-NO3- only in the digestate treatment (3.45/2.34 mg/kg). We recommend the use of digestate to kohlrabi as it results in comparable or better yield and qualitative characteristics in comparison with mineral fertilizers.
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