How to Cite
Abstract
Soil organic matter is a complex system of substances in a dynamic and continuous state, a product of the decomposition of animal and plant remains. It is vital for plant development through its effects on the soil's physical, chemical, and biological properties and plays a fundamental role in the migration and transformation of heavy metals in the soil. Its composition is rich in functional groups with negative charges, which gives it a high capacity for absorbing large quantities of heavy metal cations, acting as a natural migratory carrier of metals. Post-harvest cocoa residues are a potential remediation agent for soils contaminated with heavy metals. In this regard, cadmium has been the subject of discussion in recent years due to progressive regulations from the European Union, which establish a maximum limit on the permissible content of this metal in cocoa and its derivatives marketed in Europe and the rest of the world. This research evaluated the remediation behavior of post-harvest cocoa compost in cadmium-enriched soil. Laboratory tests were conducted, characterizing the organic amendment by determining its physicochemical and biological properties. Germination tests were also performed to study the phytotoxicity of the amendment. The results obtained under the established working criteria provided information on the dynamics of cadmium in the amendment. A residual effect of the organic amendments on the solubility of heavy metals was observed, as organic matter can undergo transformations over time, and cadmium extraction from the soil depends on factors such as pH, cation exchange capacity (CEC), and electrical conductivity (EC) over time.
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