State of copper, zinc and their reserves in irrigated and virgin seriozems of Uzbekistan

The aim of the study was to assess the content and allocation of copper and zinc reserves, as well as their distribution in the profile of virgin, newly irrigated, old-irrigated typical sierozem of the Tashkent-Keles geomorphological district, Tashkent region of Uzbekistan. The studied virgin and irrigated typical sierozems are characterized by medium loamy granulometric composition. The total copper content in the upper horizon varies from 18 to 27 mg / kg, zinc from 55 to 104 mg / kg. The share of clay fraction is from 12 to 24%. Copper and zinc reserves were identified - labile, near and potential. Fluctuations in copper reserves, from the total content, in the arable horizon were revealed: labile from 1 to 6%, potential from 33 to 52%, near, dominating in the total content 64%. The content of zinc reserves in the arable horizon: labile from 6 to 18%, near from 16 to 44%, potential, dominating in the total content up to 55%. In the arable horizon, there is an accumulation of insoluble forms of copper and zinc, which increases the resistance of soils to water erosion due to the formation of water-resistant structures. It was found that the near and potential reserves of copper and zinc are presented in a fairly large amount, and the labile in a slightly smaller amount. It was found that the distribution of copper and its reserves in the studied soils is uneven and depends on many factors, such as the age of irrigation and soil cultivation, which increase both the total content of copper and zinc, their reserves, and their content in the clay fraction.

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