The article provides calculations of the magnitude of the flushing norm supplied to saline soils in two stages: at the first stage, the calculation of the volume of water needed to bring the moisture of the calculated soil layer to the maximum field moisture capacity, at the second stage - the volume of water consumed to displace the dissolved salts from the root layer and the number of leaching, as well as the procedure for submitting a one-time leaching rate to the irrigated lands being leached in the districts of the Republic of Karakalpakstan.