Purpose: to provide scientific and experimental justification for the application (adaptation) of the domestic formula by A. E. Nerozin for calculating leaching rates using the assessment of saline lands according to the FAO classification by electrical conductivity.
Materials and methods: a database of experimental studies, statistical data processing, empirical equations, and refinement of salt leaching coefficients.
Results. Many relationships for determining leaching rates have been developed in domestic land reclamation science. Almost all formulas take into account such soil properties as the soil bulk density, the maximum soil field moisture capacity, and the soil moisture before leaching. In the formulas by A. N. Kostyakov, L. P. Rozov, S. F. Averyanov, and A. E. Nerozin, the leaching rate consists of a portion of water used to saturate the soil (to dissolve salts) and a portion used to displace salts from the soil. The FAO methodology for calculating leaching rates using a balance model takes into account salt leaching based on the reduction in electrical conductivity (ECe) of a saturated soil extract, in accordance with the international classification for assessing soil salinity. A. E. Nerozin's formula accounts for salt leaching based on the chloride ion content leached from the soil layer by 1 cubic meter of water. Currently, regularly irrigated soils in Uzbekistan generally contain low levels of chlorine (soils are saline with toxic sulfate salts of magnesium and sodium, the salinity type is sulfate and chloride-sulfate). The possibility of using refined salt leaching coefficients according to ECe by two methods was established: by converting the chlorine leaching coefficient K in A. E. Nerozin's table and using the empirical equation for specific water consumption to reduce soil salinity by 1 dS/m.
Conclusions. Based on the existing experimental leaching data base, A. E. Nerozin's domestic model for calculating leaching rates, corresponding to the FAO model for the considered soil parameters (moisture, saturation), was adapted to the international classification of soil salinity assessment according to ECe.
leaching of saline soils, experimental database, leaching coefficients, international soil salinity classification, adapted calculation formula, flushing rate
Jurayeva N. X., Shirokova Yu. I., Paluashova G. K. Adaptation of the domestic model for calculating leaching water rates to the international classification of soil salinity. Ways of Increasing the Efficiency of Irrigated Agriculture. 2026;98(1):159–174. (In Russ.).
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