Azizdzhan fazilovich babadjanov

N = h * F * δ * S
where: h is the average thickness of the layer in (m); F is the area of the district in (m2); δ-volumetric weight of dry rock in (t/m); S- quality of soluble salts in (%) per 1000 g of dry rock; Based on the results of this approach, the calculated salt reserves are carried out by subsections, subdistricts and districts.
In the central and southeastern parts of the Karshi steppe with an area of 330,500 ha, the total salt reserve in a three-meter soil layer is 126.798 million tons, which averages 380 t/ha
A high salt content (710 t/ha) was noted in the three-meter thickness of soils of the low mountains of Alyaudintau, Dultalitau, Saksandara with adjacent peripheral parts. From the peripheral parts of the low mountains in the northern and northwestern directions, there is a decrease in the salt content, and within subregions II - B 550 t / ha. The largest amount of easily soluble salts (890 t/ha) was found in the soils of the Charagyl depression (subregion III-D), where an intensive process of salt accumulation takes place due to the evaporation of highly mineralized groundwater that emerges from the proluvial plains.
Therefore, the materials presented allow us to distinguish three large areas according to the distribution of salt content:

• 
  accumulative - delta plain (engineering - geological region) III;
  
• 
  denudation - accumulative plain with adjacent eolian - deflationary - accumulative plain;
  
• 
  low mountains of Alyaudintau, Dultalitau and Saksondara with adjacent peripheral parts (geological engineering region).
  

Thus, finishing the characterization of engineering and geological subsections, we can say the following:
Of the total area of 330,500 ha before the start of their development, non-saline lands accounted for 37,200 ha or 12%, slightly saline - 141,700 ha or 41%, moderately saline - 48,800 ha or 16%, highly saline or 21%, solonchaks - 32,000 ha or 10%. The stock of salts in the meter thickness of soils in average values for the entire area and for one (ha) was obtained in the following ratios:

• 
  with non-saline soils, the salt reserve amounted to 1586 thousand tons, or 42.6 t/ha;
  
• 
  with slightly saline 4694 thousand tons. or 33.1 t/ha;
  
• 
  with moderately saline 7922 thousand tons. or 162.4 t/ha;
  
• 
  with highly saline 12441 thousand tons. or 175 t/ha; solonchaks 7830 thousand tons or 245 t/ha
  

Irrigation of the territory has made a sharp change in the salt composition of soils, primarily the three-meter active stratum, as a result of which most of the indicators of engineering and geological properties of soils in the aeration zone will also change.
In this sequence, the engineering and geological characteristics of regions, subdistricts, sections and subsections are set out, indicating the main parameters in the expanded explication attached to the map of engineering and geological zoning (Fig. 2). The numerical values of indicators of engineering and geological soils given in the explication were compiled based on the results of numerous field and laboratory analyzes.
The large-scale engineering-geological zoning carried out in combination with hydro-geological-reclamation zoning is the initial initial state in our country when assessing the impact of land irrigation on groundwater. For this reason, the results of complex hydrogeological and engineering-geological studies are given in such detail .