Effect of Compost and Humus of Organic Solid Waste on the Reduction of Cadmium in the Soil and in Different Organic of Seedlings Theobroma cacao (CACAO) in Nursery

It was carried out in the facilities of the Faculty of Agronomy of the National Agrarian University of the Jungle, the objective was to evaluate the effect of compost and humus obtained from the transformation of organic solid waste in the reduction of concentration of cadmium available and total in soil and total cadmium in organs of cocoa seedlings, with a complete random design with 15 repetitions, with factorial arrangement. The soil worked is alluvial, sandy loam with 2.3 ppm of total cadmium, inoculating it with cadmium sulfate (45 days) to obtain 4.86 ppm, we proceeded to fill the bags at a proportion (20/30/40/50/60 and 70%) of compost and humus, to sow a pre-germinated seed of Theobroma cacao L. The results show that compost and humus statistically have the same effect on the concentration of cadmium available in the soil. Cadmium would have been adsorbed by organic matter, and would form stable complexes with humic acids, fulvic acids, humines, carboxylic acids and methoxylic acids. The application in high concentrations of organic matter would affect the growth of cocoa negatively, having obtained greater growth in treatments without cadmium inoculation and without organic matter.