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Effect of the addition of municipal solid waste compost on microbial biomass and enzyme activities in soil



Effect of the addition of municipal solid waste compost on microbial biomass and enzyme activities in soil



Biology and Fertility of Soils 10(3): 221-226



Changes in the content of C, N, P, and S in the soil biomass and in phosphatase, urease, protease, deaminase, and arylsulphatase activity, induced by amendment with municipal solid-waste compost, were determined in a clay loam soil during 1 year of incubation at 25.degree. and 35.degree. C. In the unenriched soil (control) decreasing trends in biomass C biomass N, and biomass S were observed at both temperatures. In the enriched soil, these values increased, reaching a maximum after 1 month. Biomass P, proably due to a slower process of P immobilization, showed different trends. Alkaline phosphomonoesterase, phosphodiesterase, and deaminase activity remained constant after reaching maximum values (3-5 months). Arylsulphatase, urease, and protease activity tended to return to baseline after reaching a maximum (2-3 months). Atrazine, through applied at a dose that was 10 times higher than the recommended field rate, did not modify the chemical and biochemical properties of either the control or the enriched soil. Significant positive and negative correlations between changes in biomass values and changes in enzyme activity were found. The negative correlations are attributed to the delay in the enzymatic response compared with the changes in microbial biomass.

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Accession: 007262089

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DOI: 10.1007/bf00336141


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