The present study was conducted to investigate the influence of fly ash on heterotrophic activities of micro-organisms in two different soils-A sandy loam alluvial soil and an acidic soil. During this study carbon dioxide evolution was chosen as an indicator ofsoil microbial activities. It was also undertaken to evaluate the effect of fly ash incorporation to soil on soilmicroflora with special reference to fIXation and cycling of nitrogen. The incorporation of fly ash into both kind of soils (sandy loam alluvial soil and acid soil) may improves soil property. It enhances the trace metal content when soil has a poor content of such elements. It also affects the pattern of carbon dioxide evolution.
Heterotrophic, micro-organism, flyash, tracemetals, soil-microjlora
