The aim of this research is engineered organic amendments (OAs) to efficiently increase organic matter in soils to improve specific soil functions by using traditional technologies of organic conversion. To achieve this, an experimental approach will be used to characterize the physicochemical changes in organic residues along different processes. Composting, fermentation-Bokashi and anaerobic digestion were selected because the different conditions under which the organic transformations are occurring. These three technologies will result in OAs with different characteristics. The degree of influence of these OAs in the soil will be tested by monitoring several soil properties in an incubation experiment. Changes in the chemical composition of the residues will be followed over microbiological changes that will be related to a partner project on charge to describe the microbial component.