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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
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.
PDF	https://www.mdpi.com/2076-3417/12/1/248/pdf?version=1640659206

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