THE TRACE ELEMENTSTHE OF THE 1-ST CLASS OF HAZARD IN SOILS OF SALINE AGRO-LANDSCAPES IN THE NORTH-EASTERN PART OF THE BARABA PLAIN

In the Baraba plain (Baraba), which occupies 65.5% (11.7 million ha) of the Novosibirsk region, saline agrolandscapes predominate in the soil cover. Their formation is due to the geological past and geomorphological location of the territory. A profile study of the microelement composition of soils, saline agrolandscapes was conducted in the northeastern part of Baraba along the catena, in which three positions were identified: eluvial (upper), transitional (intermediate) and accumulative (lower). Meadow-chernozem soil was formed at the upper position; black soil-meadow solonchak soil was formed at the intermediate position; deep solonchak soil was formed at the accumulative position. Studying of microelement composition of soils of the first class of danger (Zn, As, Cd and Pd) on catenary has shown that their distribution and accumulation are determined by the general physic-chemical properties, such as: granulometric composition, pH value, humus content and absorbing capacity. These indicators are closely related to each other and mutually condition the geochemical elemental composition of soils. The gross contents of zinc, cadmium and lead are below the MPC (maximum permissible concentration) both in the A horizon and along the soil profile and do not pose a risk to the use of this area in agricultural production. Moreover, the authors note a low zinc content, which can be increased by applying zinc-containing micro-fertilizers. Studies by a number of other authors show an increase in crop yields and improved crop quality with the application of zinc-containing micro-fertilizers. The gross arsenic content in saline agrolandscapes is close to MPC both in the humus horizon A and throughout the profile. This is due to the significant mobility of arsenic compounds and the high capacity of the studied soils to absorb them. This feature should be taken into account in the agricultural use of saline agrolandscapes.

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