ОЦЕНКА ПРИГОДНОСТИ ПОДЗЕМНЫХ ВОД ТУРИАНЧАЙ-ГИРДИМАНЧАЙСКОГО МЕЖДУРЕЧЬЯ ДЛЯ ОРОШЕНИЯ

Abstract

The article is devoted to determining the possibility of using groundwater with different degrees of mineralization and chemical composition for irrigation, which is spread in the area between the Turyanchay-Girdimanchay rivers. The efficiency of groundwater for irrigation, whose mineralization rate varies from 0.5 to 10 g/l, was assessed according to the methods and criteria adopted in the world countries. The suitability of groundwater for irrigation, which varies from 0.5 to 10 g/l, depends on the methods and criteria adopted in the world, including the degree of mineralization of water, irrigation coefficient, salinity hazard, sodium sorption coefficient, percentage of magnesium, rated for potential salinity and sodium carbonate residue. It has been determined that groundwater with a salinity of up to 3 g/l is fully suitable for irrigation according to all assessment criteria, water with a salinity of up to 5 g/l is suitable for irrigation, water with a salinity of 5-7 g/l is less efficient for irrigation. It is suitable in terms of irrigation coefficient, sodium sorption coefficient, salinity hazard and sodium carbonate residue, and according to three indicators it is not suitable for irrigation. Water with a salinity of 7-10 g/l is not suitable for irrigation according to all assessment criteria. However, these waters have a favorable chemical composition, neutral and balanced salt content, and in years of acute water shortage, groundwater with a salinity of 7-10 g/l can be used for irrigation of crops using special irrigation methods and technologies. At the same time, it was found that the groundwater is not contaminated. The content of pollutants and heavy metals in these waters does not exceed the permissible limits. The content of ni-trite in groundwater was 0.012-0.019 mg/l, nitrates - 1.10-1.72 mg/l, and the amount of ammonium - 0.07-0.08 mg/l. The amount of iron in heavy metals was 0.05-0.06, aluminum - 0.09-0.19, zinc - 0.004-0.005 mg/l. Metals copper and lead, as well as oil products were not found in the water. Biochemical oxygen consumption ranged from 1 to 5 mg/l.