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Influence of fertilization with dairy sewage sludge sanitised with coal fly ash on microbiological activity and concentration of heavy metals in grey-brown podzolic soil

100%

Jezierska-Tys S., Frac M.

Journal of Elementology

2008

tom 13

nr 4

535-544

The aim of the study was to determine how dairy sewage sludge (DSS) sanitised with coal fly ash affected microbiological properties of soil and level of heavy metals in soil. The experiment was performed under laboratory conditions (pot experiment). The experiment was carried out on grey-brown podzolic soil, formed from heavy loamy sand, of acidic reaction. Pots were filled with 4 kg of soil. The investigations were performed in three replications. Two rates of dairy sewage sludge fertilization: 1 and 2.5% DSS⋅kg-1 of soil were applied. The soil in pots was watered to 60% of the total water capacity and incubated for 4 months. Analyses included assays of the total number of bacteria and fungi, number of cellulolytic bacteria, respiration and dehydrogenase activity and concentration of heavy metals. It was confirmed that dairy sewage sludge had a significant effect on properties of soil. It positively affected microbiological activity of soil. The test doses (1; 2.5%⋅kg-1) of dairy sewage sludge sanitised with lignite ash caused stimulation of the growth of bacteria and fungi in soil. Dairy sewage sludge had an inhibiting effect on the dehydrogenase activity and stimulated the respiratory activity in the soil under study. The incorporation of dairy sewage sludge caused a non-significant increase of heavy metal content in soil, which was much lower than the norms.

Ograniczanie wyników

1 Journal of Elementology

1 Frac M.

1 Jezierska-Tys S.

1 2008

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Influence of fertilization with dairy sewage sludge sanitised with coal fly ash on microbiological activity and concentration of heavy metals in grey-brown podzolic soil