Biosolid and municipal solid waste effects on physical and chemical properties of a degraded soil

摘要

Anaerobically digested biosolid and the organic fraction from a municipal solid waste were surface applied at 80 t/ha to a degraded highly carbonated soil (Rendzic Leptosol) from the southeast of Madrid (Spain) to determine the effects of these organic wastes on soil physical and chemical properties. After one year of the waste application, soil samples at 0-15 cm and 15-30 cm depths were taken. The structure of the soil was slightly improved by a small decrease in particle and bulk densities, andan increase in water retention accompanied by an increase of organic matter. Waste application also increased the amorphous iron oxide contents and the total heavy metals in the soil, in particular the Cu and Zn contents in the surface level. The significant increase of Zn in the subsurface level suggests that Zn migrated in this soil profile, probably due to its affinity with organic matter soluble fractions.