| Title |
Use of Digestate as Organic Amendment and Source of Nitrogen to Vegetable Crops |
| ID_Doc |
26325 |
| Authors |
Horta, C; Carneiro, JP |
| Title |
Use of Digestate as Organic Amendment and Source of Nitrogen to Vegetable Crops |
| Year |
2022 |
| Published |
Applied Sciences-Basel, 12, 1 |
| DOI |
10.3390/app12010248 |
| Abstract |
Anaerobic digestion is a valuable process to use livestock effluents to produce green energy and a by-product called digestate with fertilising value. This work aimed at evaluating the fertilising value of the solid fraction (SF) of a digestate as an organic amendment and as a source of nitrogen to crops replacing mineral N. A field experiment was done with two consecutive vegetable crops. The treatments were: a control without fertilisation; Ni85 mineral fertilisation with 85 kg ha(-1) of mineral N; fertiliser with digestate at an increasing nitrogen application rate (kg N ha(-1)): DG-N85 DG-N170, DG-N170+85, DG-N170+170; fertilisation with digestate together with Ni: DG-N85+Ni60, DG-N170+Ni60, DG-N170+Ni25. The results showed a soil organic amendment effect of the SF with a beneficial effect on SOM, soil pH and exchangeable bases. The SF was able to replace part of the mineral N fertilisation. The low mineralisation of the stable organic matter together with some immobilisation of mineral N from SF caused low N availability. The fertilisation planning should consider the SF ratio between the organic N (NO) and total N (TKN). Low NO:TKN ratios (approximate to 0.65) needed lower Ni addition to maintaining the biomass production similar to the mineral fertilisation. |
| Author Keywords |
anaerobic digestion; circular economy; green energy; N use efficiency; short carbon cycle |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000752549200001 |
| WoS Category |
Chemistry, Multidisciplinary; Engineering, Multidisciplinary; Materials Science, Multidisciplinary; Physics, Applied |
| Research Area |
Chemistry; Engineering; Materials Science; Physics |
| PDF |
https://www.mdpi.com/2076-3417/12/1/248/pdf?version=1640659206
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