Effects of continuous addition of urban waste compost on physical and microbial soil properties
Keywords:
soil density, soil aggregation, bacteria, actinomyces, fungi.Abstract
The addition of urban waste in the soils can promote environmental modifications. A field experiment on a soil (Paleudult) was carried out to evaluate some physical and microbiological characteristics after continuous applica- tion of doses of municipal solid waste (MSW) compost. Progressive doses of MSW compost (0, 20, 40, 80, and 160 t ha–1) and one dose of mineral fertilizer were tested on soil for a three years period. The results obtained showed that when the amount of compost increases, soil density decreases, whereas aggregates stability increases under rain until 80 t ha–1 of compost. The number of colony forming units of bacteria increased according to the compost dosage althou- gh the populations of actinomyces and fungi were not affected. In conclusion, the application of 80 t ha–1 of MSW com- post was the recommended dose for the maintenance of physical and microbiological characteristics of agricultural soil.
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