The aim of this experiment was to study the influence of various concentrations of selenium added to the soil on the changes in plant enzymes. The wheat plants of the Kobra variety were grown in 0.5 dm3 pots filled with silt loam, of 1.92% organic C content. The soil was previously supplemented with the following concentrations of selenium: 0; 0.05; 0.15 and 0.45 mM · kg^-1. After 7 days the activity of acid and alkaline phosphatase, catalase and peroxidase were examined. The results of the study showed that selenium application caused the activation of oxireductive enzymes. The maximum catalyse activity was observed at concentration of 0.45 mM · kg^-1 and peroxidase at 0.15 mM · kg^-1. The concentration of 0.15 and 0.45 mM · kg^-1 of selenium slightly increased the activity of alkaline phosphatase and inhibited the activity of acid phosphatase.

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