Assessment of certain micronutrients and pollutant elements in soils of tushka

Abstract EN

Fifty-two soil samples collected from eighteen soil profiles representing the studied area of Toshkent were investigated to assess their contents of Fe, Mn, Zn, Cu, Pb, Co, Ni, and Cd and their conventional physical and chemical properties were determined.

Total and DTPA-extractable Fe, Mn, Zn, Cu, Pb, Co, Ni, and Cd were determined.

The data indicate that the soil texture varies from loamy sand to clay loam, CaCO3 ranged between 1.10 and 21.76 %, while organic matter content was low.

The average total contents of Fe, Mn, Zn, Cu, Pb, Co, Ni, and Cd were 2.29 %, 422.68, 17.60, 8.59, 6.46, 8.90, 414.0, and 0.24 mg / kg, respectively.

Most soils have their DTPA-extractable Fe lower than the critical level, in contrast to excessive levels of Mn, while the DTPA-extractable Zn and Cu were in the range of adequacy.

On the other hand, data indicate that the average contents of Pb, Co, Ni, and Cd were 0.062, 0.404, 0.192 and 0.007 mg / kg, respectively.

Computation of the statistical measures (weighted mean, trend and specific range) of total and chemically-extractable elements revealed that the studied elements are somewhat lower in the surface or follows an opposite trend when increased in the surface layer than the deeper ones as indicated by the common positive or negative values for the trend, and the values of specific range indicate that pyogenic processes had acted in a uniform manner through the solum.