Industrial composting of low carbon/nitrogen ratio mixtures of agri-food waste and impact on compost quality

[Display omitted] •Optimal conditions for composting are difficult to meet at industrial scale.•Different agri-food waste produce compost of similar standards.•Phytotoxic/phytostimulant trait did not match the degree of humification.•Quality compost was obtained from deficient agri-food waste-based mixtures.•Management operations during composting correct the raw materials deficiencies. The agri-food waste (AW) require amendments for composting to adjust nutritional and physicochemical deficiencies. The theoretical mixtures formulation is difficult to reach on an industrial scale. The main objective of this work was to evaluate to what extent the composition of AW-based mixtures determines the quality of the final compost produced at the industrial scale. Raw materials having the same AW share characteristics, irrespectively of the amendments added, but their compost were different. All the materials were biological stable at the cooling phase, and mature enough at the end, although the degree of humification did not match with the absence of phytotoxicity. The final compost had sufficient quality even though the AW-based raw materials have a low C/N ratio (