**5. Conclusions**

The applications of poultry and pork slaughterhouse waste increased crop productivity, especially in T5 (50% SOR + 50% SMF). The C labile pools (C‐HW, C‐OXP and POC) were higher in the treatments with elevated SOR applications (50% and 75%), thereby increasing soil quality and sustainability. In addition, fertilization with SORs demonstrated to be an alterna‐ tive to minimize the costs and use of mineral fertilizers and increase C sequestration.
