The research goal is to develop the methodology of ecologic and meliorative monitoring of old-irrigated soil condition. The analysis of aqueous extract data showed no significant deterioration of the lands’ meliorative condition over the period of irrigation. There following had occurred: the redistribution of salts, change in their composition and development of resalinization in some local areas near water bodies. The issues of resalinization are associated not only with phreatic rise and evaporation of mineralized groundwater, but also with the increase of salinity and alkalinity of groundwater. Some changes in the soil occurred over the period of irrigation. 

The study of the arable layer showed that the soil reaction in the humus horizon of an irrigated plot ranged from weak-acid to alkaline though it was close to neutral in the greater part of the area. Most soil tests (over 45%) characterize the soil as low-humus, slightly humic soils make about 33%, and medium-humic soils are found in 22% of samples. The content of labile phosphorus in the arable layer of the plot varies from very low to high (the data of 2014). During ten years of irrigation the soil was impoverished in terms of labile phosphorus content over the greater part of the plot; the labile phosphorusmoved down the terrain. In spite of some changes the soils are suitable for irrigation provided strict observance of agronomical practices. The substantiation of the methods of soil water-salt regime control requires the consideration of the dynamics of soil solution content and soil absorbing complex, i.e. the consideration of the transporting processes of calcium, sodium and magnesium ions in the soils taking into account the ion-exchange sorption.

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