Ecological and melioration state of irrigated sierozem soils of the territory of Nurabod district, Uzbekistan

The article presents research on the study of the agrochemical and salt state of irrigated sierozem soils, the accumulation of mobile heavy metals in soil layers. The granulometric composition of the irrigated light sierozem soils was found to consist of light loam in the 50 - 80 cm layer, including the plow layer (Ap horizon) and underlying subsoil, while the deeper layers contained medium loam, with a pH ranging from 7.06 to 7.67. Chromium element is 40.55 - 12.61 mg/kg in the layer of 0 - 30 cm, 33.46 - 15.0 mg/kg in the plowed soil, it is 4.45 times higher than MPC (Maximum Permissible Concentration) in the soil layers. Copper in the soil is 6.09 - 4.71 mg/kg in the 0 - 30 cm layer, 1.57 → 1.62 → 1.77 → 1.83 → 1.94 → 1.94 → 2.03 times higher than MPC, it was found that it increased to 5.29 - 6.08 mg/kg in the 100 - 150 cm and 150 - 200 cm layers towards the lower layer. The third element polluting the soil composition is cadmium, which is up to 1.92 times higher than MPC in the 100 cm and 150 - 200 cm layers of the soil. The amount of lead is also higher towards the lower layers of the soil up to 9.62 - 10.71 mg/kg, which is 1.60 - 1.79 times higher than MPC. It was determined that the soil composition was not affected by cobalt, nickel and zinc elements.

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