Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Sviatoslav BALIUK, Maryna ZAKHAROVA, Ludmila VOROTYNTSEVA
The results of studies of chernozems salt regimes in the forest-steppe and steppe of Ukraine during irrigation, in postirrigated period and their non-irrigated analogues are presented. In irrigated soils accumulation of salts up to the level of classification-significant changes when using “suitable” and “limited suitable” waters (national classification of the irrigation water quality) not observed. With long-term use of “unsuitable” water for irrigation, the degree of soil salinization is low. Salt regimes of post-irrigated chernozems are characterized by a tendency to restore their parameters to values characteristic of non-irrigated analogues. The intensity of transformations depends of the degree of soil changes during irrigation, the climatic features, soil properties and duration of post-irrigated period. In postirrigated period after long-term irrigation by “suitable” and “limited suitable” waters, forest-steppe and steppe chernozems restore the salt regime to the level of non-irrigated analogues in 4-12 years. The ending of irrigation with “unsuitable” waters of the steppe chernozems also make for their desalinization, however, it is needed a longer period of time. The predictive model of the soil processes direction in post-irrigated period is developed.
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