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Salinity is one of the main causes of degradation in the soil environment. The long-term salinity affects the properties physicochemical and activity of the biological parameters in soil considerably. The aim in the study was to assess the content of selected macroand microelements and enzymatic properties in soils in areas adjacent to the soda plant. The research was conducted in the area adjacent to the CIECH Soda Polska S.A. in Inowrocław. This study presents an assessment of the content of selected bioavailable macroelements (P, K, Mg) and microelements (Zn, Cu, Mn, Fe) against the background of the enzymatic activity (dehydrogenases, catalase, peroxidase, and alkaline and acid phosphatase) of soil. The soil was sampled from surface mineral horizon (0–30 cm deep). Seven sites were selected for soil sampling (S1–S6 on the grounds of a soda plant, and area C – the control). The effect of long-term salinity on the studied soil properties was found. The content of available macroand micronutrients varied signifi cantly depending on the soil sampling site. The presented results did not show unidirectional changes in the content of available P, K, Mg, Zn, Cu, Mn and Fe, nor in the activity of dehydrogenases, catalase, peroxidase, or alkaline and acid phosphatases in the technogenic soil. In the analysed soil samples, contents of the bioavailable forms of all the tested microelements were found to be low. The activity of the tested enzymes was found to be lowest in soil from S6 (in the vicinity of waste dumping sites, a sewage treatment plant and the soda plant). Keywords

The content of available macro- and microelements against the background of enzymatic activity in soils affected by the soda industry