| Title | Use of Tannery Waste Anaerobic Digestate as Agricultural Fertilizer: An Analysis of Oat Growth and Soil Fertility |
|---|---|
| ID_Doc | 13296 |
| Authors | Simioni, T; Agustini, CB; Dettmer, A; Gutterres, M |
| Title | Use of Tannery Waste Anaerobic Digestate as Agricultural Fertilizer: An Analysis of Oat Growth and Soil Fertility |
| Year | 2023 |
| Published | Waste And Biomass Valorization, 14, 4 |
| Abstract | Anaerobic digestion process produces a biologically stable and potential high-value fertilizer product, digestate, which can be used as an alternative to mineral fertilizers on crops, completing biological nutrient cycles and contributing to a circular economy. This work evaluated the agronomic value and phytotoxic effect of the liquid digestate (LD) obtained from the mesophilic anaerobic co-digestion of tannery wastes by seed germination, oat growth bioassays and macroelements content in the soil. Its performance was compared to mineral fertilizers. Germination index close to 120% (compared to the control) was obtained for germination tests with 1% LD, indicating that this digestion solution contains nutrients and should have bio stimulating effects on plant development. The results of the oat growth bioassays confirmed these findings since plants grown in soil treated with LD reached statistically similar final mean height (p > 0.05) to plants grown in soil treated with nitrogen-phosphorus-potassium (NPK) fertilizer or urea, and final dry weight significantly higher than the condition treated with NPK fertilizer (p < 0.05). The analysis of the soil showed that the LD provided the soil with the same nutrients as the other fertilizers tested and that the nitrogen added by all the treatments is essentially inorganic. The application of LD does not seem to have affected the pool of soil organic matter, nor did it cause accumulation of metals in the soil. The digestate used in this work appeared to have a high degree of stability and can be used directly in soils as mineral fertilizer. [GRAPHICS] . |
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