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      • Open Access Article

        1 - Qualitative study of surface water sources to achieve sustainable agriculture and natural resources (case study: Aras Border River)
        Milad Tabatabaei Hashemi Mahdi Sarai Tabrizi Hossein Babazadeh
        Since the agricultural sector is the main consumer of water in the country, achieving sustainable agriculture without considering environmental issues may lead to risks in the long term, therefore, the quantity and quality of surface water is so important in agriculture More
        Since the agricultural sector is the main consumer of water in the country, achieving sustainable agriculture without considering environmental issues may lead to risks in the long term, therefore, the quantity and quality of surface water is so important in agriculture. This research has investigated the Ares River catchment area with the aim of qualitative monitoring of surface water resources to achieve sustainable agriculture and natural resources. More than 100 collected samples from 9 stations of Aras River between Yaichi village in Azerbaijan and near Aras Dam from October 2017 to August 2018 have been investigated, classified, and evaluated using the Wilcox agricultural water quality index and Grapher software. The results of this research showed that the samples in Schuler's diagram were within the acceptable range but for drinking, other effective elements should also be investigated. The lowest amount of sodium absorption ratio was in June (1.40 mg/L) and the highest amount was in November (3.43 mg/L). Also, the electrical conductivity of water was the lowest value in June (840 µs/cm) and the highest value in October (1375 µs/cm). According to the Wilcox diagram, all the samples were in the qualitative range of C3S1 and they are considered saltwater. Despite the high level of salinity in the samples of this river, there was no significant difference in the qualitative trends of the stations during the investigated period for agricultural use, but the necessary measures should be taken in using these waters. Manuscript profile
      • Open Access Article

        2 - Water resources of Astaneh city and studying effective factors on it with statistical, graphical methods and GIS
        Mohammad Dordi Mahmoodi AliReza Moradian Harehdasht Ataollah Nadiri
      • Open Access Article

        3 - Drought effects on surface water quality in Golestan province for Irrigation Purposes, Case study: Gorganroud River
        Nader Jandaghi Ali Heshmatpour Mojtaba Ghareh Mahmoodlu Saeedeh Pasand
        In this study, a part of the Gorganroud basin was selected to evaluate of the drought effect on 13 water physicochemical parameters. After collecting meteorological and hydrometric stations data in a period of 43-year (1350-1393), a 5-year drought index was determined u More
        In this study, a part of the Gorganroud basin was selected to evaluate of the drought effect on 13 water physicochemical parameters. After collecting meteorological and hydrometric stations data in a period of 43-year (1350-1393), a 5-year drought index was determined using the standard precipitation index and moving average method. Then, the water quality parameters were obtained for a long-term and a drought period using the available hydrometric stations data. The average concentration of most of anions and cations, electrical conductivity, and sodium adsorption ratio have increased from upstream to downstream, so that, this increase in the downstream station is about seven times higher than its upstream station in the drought period. The average of anions, cations, electrical conductivity, and sodium absorption ratios were increase during the drought period compared to the long-term period. Using the Wilcox diagram, agricultural water quality is decreases in the direction of river flow, so that the water category changes from C2S1 (suitable for agriculture) in the upstream to C4S3 (harmful to agriculture) in the downstream. Therefore, it can be concluded that the occurrence of drought periods has a significant effect on the water quality factors in comparison with the long-term period, so that, the agricultural water quality drastically has reduced by a decrease in rainfall and subsequently decrease in river discharge within the drought period. Manuscript profile