The possibility of irrigation with low-mineralized water, the peculiarities of salt accumulation in the soil under drip irrigation, and the use of this method to remove accumulated salts from the root zone of the soil are considered. Technologies to reduce negative effect of salt content in irrigation water, including those protected by patents of the Russian Federation are presented. Irrigation of weakly-mineralized water containing up to 3 g/ l salts is possible under certain restrictions it specific processing in installations, which reduce total salt content and provide balance in ionic composition, which eliminates salinization and the development of soil alkalinity. Without special preparation water with a salinity more than 0.7 g / l can be used only against the background of high natural drainage of the site or artificial drainage with percolative moisture regime. More effective method of mineralized water preparation to irrigation is membrane technology application for selective deionization more dangerous for plants.

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The article deals within matters of the mineral elements removal with drainage water on reclaimed lands, on the Central Russian and Volga Uplands in an unstable hydrothermal regime. The reuse of drainage water for irrigation with the use of sprinkler and drip irrigation are assessed. Taking the example of drip irrigation is being considered the possibility of the most effective influence during the plant growing season on the hydrothermal regime of the soil and the ground-level pollution both in a dry year and in case of excessive rainfall. The features of drip irrigation technology with use of a mulching screen made of a membrane film with selective moisture permeability are described. The proposed method of drip irrigation of early varieties of potatoes due to more intensive condensation of water vapor on the inner layer of the screen allows to maintain a more stable daily soil temperature. The screen opaqueness inhibits the germination of weeds in wet row spacing, capillary humidification of the tuber formation zone in combination with the screen permeability for air prevent anaerobic processes in this part of the furrows and its overmoisturazing. The application of the proposed method of potato cultivation during drip irrigation provides the rational use of rainfall, increasing the uniformity of field moistening and reducing moisture loss, and also prevents the soil overwetting in the zone of tuber formation and provides aeration of the soil under the screen.