The Influence of Vermicompost and Various Concentrations of Lead on the Enzymatic Activity of Sierozem Soils of Kazakhstan

Figure 1

Optical density of humus acid. Humic acid (a) 1-control soil (without Pb); with the introduction of Pb into the soil, mg/kg: 2-16, 3-80, and 4-160. Fulvic acid (b) 1-control soil (without Pb); with the introduction of Pb into the soil, mg/kg: 2-16, 3-80, and 4-160.

(a)

(b)