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Biological indicators of soil quality after application of dairy sewage sludge

Frąc M, Jezierska-Tys S.

Environment Protection Engineering

2009

Vol. 35, nr 4

49-61

Microbiological indicators can be used for the assessment of the ecological condition of soils affected by various environmental and anthropogenic factors. The objective of the study was to estimate the causative effect of sludge from dairy sewage treatment plant on enzymatic activity of dehydrogenases, protease and urease and on nitrogen transformations (intensity of ammonification and nitrification) in a brown soil. The microbiological and biochemical tests applied proved to be sensitive indicators of the biological properties of soil fertilised with sludge from a dairy sewage treatment plant.