THE SELENIUM TRANSFER FROM THE SOIL INTO THE AGRICULTURAL PLANTS IN NITRA REGION OF SLOVAKIA.

In our work the Se content was evaluated in the soils of Nitra region and in the grains of wheat grown on these soils as well. Samples were collected during harvesting from 28 localities. The Se content was determined by AAS method using the electrothermic atomization vapor both in the grains and in the soils. The average Se content in the grains of wheat of Nitra region was 53 µg.kg^-1. This value exceeds the average content in Slovakia (28.9 µg.kg^-1). The Se distribution in the whole area of Nitra region was different. In Nitra district in the soils with alkaline soil reaction (Chernozem, Fluvigleyic Pheozem) the Se content was high. The very low Se content in grains was determined in the districts of Topoľčany and Zlaté Moravce, although its soil content was high (brown soil with medium acid or neutral soil reaction). The average value of total soil Se content of Nitra region exceeded the limit value 1.25 - times. The Se grain content grown on the soil of the north of Nitra region was non-detected despite the fact that its soil content was over-limited. The Se intake by the plants depends on its form in the soil and on the soil type as well. [ABSTRACT FROM AUTHOR]