The purpose of the study was to define the influence of drip irrigation by saline ground water which contains significant amount of soluble sodium (up to 0.470g/l) on solonetzicity of hothouse soils. Vegetables were grown on damaged regional soils which fertility was improved by application of organic and mineral fertilizers. Vegetables were irrigated by drip lines, laid under each row of plants or by one line for two rows of tomatoes. It is defined that drip irrigation contributes to annual increase of sodium content in soil absorbing complex up to 0.20-0.50 % from the sum of absorbed bases. Drip irrigation promotes the redistribution of absorbed sodium and calcium throughout the hothouse soil area and sodium accumulation in interlines (if two rows of tomatoes are irrigated by two drip lines) and in rows of plants (if two rows of tomatoes are irrigated by one drip line). The least content of absorbed sodium is in interlines where the moisture patterns do not close completely. To prevent and eliminate the solonetzicity of hothouse soils we recommend to conduct soil reclamation by using ÑàSO4•2Í2Î and self-reclamation by periodic milling across the rows of plants and annually replacement of the layout of plants, interlines, and drip lines.
