Annotation

Purpose: evaluation of water availability from open collectors of Semikarakorsky district Rostov region for agricultural land irrigation and forecasting the possibility of their influence on salt composition of agricultural lands. 

Materials and methods. The object of the study was the collector-drainage water in the open collectors of Semikarakorsky district Rostov region K-3, LS-2, MKL-7, BG-MS-4, TsS. The soil-reclamation assessment of water availability for irrigation was carried out according to the following indicators: total water salinity (according to A. N. Kostyakov), chloride ion content, sodium adsorbability index (according to I. N. Antipov-Karataev method), sodium, magnesium alkalinization, and soil soda formation. 

Results. Laboratory studies of collector-drainage water quality showed that water mineralization in all collectors throughout the growing season did not exceed 1.5 g per cubic dm. The water quality in all collectors at the beginning of the irrigation season does not meet the requirements for irrigation water for the chloride ions content (more than 4 meq per cubic dm), and, therefore, the water is unsuitable for use as irrigation water without preliminary treatment. An exception is the water in the collector BG-MS-4, where the content of chloride ions did not exceed 2.72 meq per cubic dm. The sodium ions content in all collectors is more than 1 meq per cubic dm, which indicates the danger of sodium alkalinization processes development. From the point of view of possibility the development of processes of magnesium alkalinization and water soda formation are not dangerous. 

Conclusions. Before using water from open collectors for irrigation, a correction of chemical composition is necessary, primarily for chloride ions and sodium ions. To accumulate drainage effluent water, it is recommended to build water storage basins in a water flow with subsequent correction of the chemical composition, returning a part of the purified water to the irrigation system, and a part to a collector for diluting the drainage effluent water before its discharge into a natural water body.

DOI: 10.31774/2222-1816-2020-3-154-169

For quoting

Drovovozova, T. I. Assessment of water availability from open collectors for irrigation in Semikarakorsky district Rostov region / T. I. Drovovozova, N. N. Panenko, S. A. Manzhina // Scientific Journal of Russian Scientific Research Institute of Land Improvement Problems [Electronic resource]. – 2020. – № 3(39). – P. 154–169. – Mode of access: http:www.rosniipm-sm.ru/en/article?n=1144. – DOI: 10.31774/2222-1816-2020-3-154-169.

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