The effect of sulfate and elemental sulfur application on modification of concentrations of manganese and lead in soil.

摘要

Soil acidification due to sulfur fertilization can produce an indirect result such as increased solubility and mobility of heavy metals in soil, thus affecting availability to plants of these elements derived from both natural and man-made resources. The purpose of this paper has been to explore the effect of incremental doses of sulfate and elemental sulfur on changes in the natural content of easily soluble forms of manganese and lead in two soil horizons: 0-40 and 40-80 cm. A three-year field experiment was set up on brown, acid soil with the texture of heavy loamy sand. Soil for chemical analyses was sampled in spring and autumn. Soluble forms were extracted from soil with 1 mol HC1 dm-3 solution and their concentrations were determined with the atomic absorption spectrophometric method. Throughout the whole experiment, the dose of 40 kg ha-1 S-SO2-₄ induced higher concentrations of manganese in soil in the 0-40 cm layer compared to the other fertilization treatments. During the three years of the field trials, the application of sulfate sulfur and elemental sulfur to soil tended to cause a small increase in the soil content of lead soluble in 1 mol HCl dm-1 in the 0-40 cm soil depth compared to the soil before the experiment. The concentrations of manganese and lead in soil in the 40-80 cm layer did not depend much on the form and dose of sulfur introduced to soil.