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espanolLa contaminacion de suelo con aceite residual automotriz (ARA) le causa perdida de su fertilidad. Los objetivos de esta investigacion fueron: a) bioestimular (BS) un suelo contaminado con 10000 ppm de ARA, con lombricomposta (LC) al 3 y 6%; y b) la fitorremediacion (FR) de ese suelo para eliminar el ARA remanente con Sorghum vulgare inoculado con Bacillus cereus y/o Rhizobium etli, ambas bacterias promotoras de crecimiento vegetal (BPCV). Las variables respuesta de este ensayo fueron: en fase de BS del suelo la concentracion del ARA en 60 dias. En fase de FR de ese suelo, la biomasa de S. vulgare inoculado con las BPCV a floracion y cantidad final del ARA. Los resultados mostraron que en suelo solo bioestimulado con LC al 3%, el ARA se redujo a 8630 ppm. Comparado con el suelo bioestimulado y luego fitorremediado con S. vulgare y las BPCV para eliminar el ARA remanente hasta 210 ppm. Este suelo bioestimulado con la LC al 3%, y luego fitorremediado con S. vulgare inoculado con B. cereus y R. etli; su biomasa fue estadisticamente superior comparado S. vulgare en el suelo sin bioestimular donde S. vulgare redujo el ARA hasta 260 ppm acorde con el ANOVA Tukey (p>0.05). Lo anterior apoya a la integracion de la biorremediacion del suelo contaminado con ARA por bioestimulacion y su fitorremediacion con S. vulgare y BPCV como forma rapida y mejor que la accion individual. EnglishSoil pollution by waste motor oil (WMO) caused soil´s lost fertility. The aims of this research where a) bioremediation of soil polluted by 10000 ppm of WMO for biostimulation with vermicompost (VC) at 3 and 6 % (w/w) follow by b) phytoremediation (PR) of the same soil to eliminate remaining WMO with Sorghum vulgare inoculated with Bacillus cereus and/or Rhizobium etli or Promoting Growth Plant Bacteria (PGPB). At the first step of assay WMO concentration was measured before and after bioremediation. At the second step the same soil phytoremediation was applied for remaining WHO sowing S. vulgare inoculated with PGPB, then at flowering stage its biomass and WHO final concentration was determined. Results showed that soil impacted by WMO biostimulated with VC at 3% was eliminated 8630 ppm of WMO. At the second phase in the same soil PR applied for remaining WMO which was reduced until 210 ppm. Soil polluted by remaining WMO applied PR using S. vulgare plus R. etli WMO was decreased at 260 ppm. While S. vulgare´s biomass inoculated with PGPB was higher compared to S. vulgare grown in soil not polluted by WMO according by ANOVA - Tukey (p > 0.05). These results suggested that soil polluted by WMO could be recovering by applying integrated BR and PR better than just using one type.

journal of the selva andina biosphere

Biorrestauración de suelo contaminado con aceite residual automotriz por bioestimulación con lombricomposta y fitorremediación con Sorghum vulgare inoculado con Bacillus cereus y Rhizobium etli