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The use of slaughterhouse organic residues (SORs) as a form of fertilization in no‐ till systems could be an alternative to promote their appropriate disposal. This chapter reports a study on a Haplic Cambisol (Inceptisol) regarding the influence of different rates of SORs applied isolated or together with synthetic mineral fertiliz‐ ers (SMFs) for 5.5 years in a no‐till system with diverse crop rotation. We evaluated crop productivity and several soil organic matter pools affected by the SOR and SMF combinations in a field experiment. In addition, a laboratory incubation experiment was performed with different rates of SORs to evaluate C‐CO2 emissions and C dynamics. The SOR applications provided significant increases in crop productivity, soil organic matter pools and C‐CO2 emissions. The SOR applications provided significant increases in crop productivity, soil organic matter pools and C-CO2 emissions. The treatment with 50% SOR + 50% SMF was the best alternative to provide higher crop productivity, while the higher use of SOR promoted more increments in soil organic matter levels. Despite the increase in C‐CO2 emissions due to the use of SORs, higher C levels were observed as a function of SOR rates. We conclude that the application of SORs combined with SMFs represents an efficient strategy to reduce costs and increase C levels, providing agronomic and environmen‐ tal benefits.

C‐CO2 Emissions, Carbon Pools and Crop Productivity Increased upon Slaughterhouse Organic Residue Fertilization in a No‐Till System