Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

The carbon (C) and nitrogen (N) mineralisation rates of five digestates were studied compared with pig slurry, compost, a solid fraction digestate in aerobic incubation experiments. objective was to identify the most relevant drivers C N based on physicochemical properties products. Net organic (Nmin,net) average 30%, although range relatively wide, from manure (39%) reaching double value sewage sludge (21%). total (TC:TN) (r = −0.83, p < 0.05) ammonium (NH4+-N:TN) 0.83, ratios products strongly correlated Nmin,net, adequately mirroring expected fertilising potential had sequestration values between 50 81% applied (TOC), showcasing their contribute build-up agricultural soils. use efficiency amended soils negatively dissolved (DOC) −0.75, suggesting that catabolic activities promoted proportionately DOC present these Ratios DOC:TOC −0.88, 0.01) TC:TN 0.92, reliable predictors would remain one year after its incorporation thus could be used as simple quality parameters denote prior field.