Assessment of organic matter stabilisation The bio degraded abilities of the feedstock, initial mixture and composts were assessed through the measurement of organic C mineralisation during incubation of soil-organic substrate mixtures under controlled laboratory conditions as described in the French standard XPU44-163 (AFNOR, 2009). This made it possible to compare
the biodegradability and stability of all organic substrates in conditions considered optimal for micro-flora and in a reference soil. The incubations were performed in four replicates in hermetically closed jars placed at 28 ± 1 C in the dark.