Fig. 5.

The activity of selected enzymes in zinc-contaminated soil supplemented with compost (PCA analysis). Deh dehydrogenases, Cat catalase, Ure urease, Pac acid phosphatase, Pal alkaline phosphatase, Glu β-glucosidase; dose of zinc (mg Zn²⁺ kg⁻¹ DM soil): I—0, II—250, III—500, IV—750, V—1000, VI—1250; dose of C_org (g kg⁻¹ DM soil): a—0, b—10, c—20; incubation time: 2—two weeks, 20—twenty weeks