In pot experiments conducted in the plant house, an investigation was carried out upon the influence of soil moisture on the uptake of metals by plants, as well as the contents in soil in their soluble forms. In the experiments, plant species with various abilities for element accumulation were cultivated, and soils with lowered or elevated Cd contents were used. An assessment was carried out in the soils upon the element forms soluble in 1 M dm^–3 HCl solution after the plants had been harvested. The amount of elements extracted from the soils after plant harvesting depended on the agronomic category of the soils, their reaction and species of cultivated plants. From light, very acid soil larger quantities of elements were extracted than from heavy soil both acid and alkaline. After the harvesting of most plant species, soils contained more metals in soluble form in the used extractor. After tobacco cultivation, soils contained the smallest quantity of Cd. Increasing soil moisture raised the amount of metals extracted from the soil, particularly after dicotyledonous plant cultivation. The addition of cadmium usually caused a decrease of metal content in soil extracts on acid soil, but in the alkaline one, its effect on the level of metals was less visible. With the increasing moisture of the soil from a combination with Cd addition, a smaller quantity of metals was extracted, especially after the cultivation of leeks.