Kerman province is located in the south of Iran, and due to its special geographical location and the influence of other factors, it is considered one of the dry regions of Iran. Therefore, due to the lack and non-uniform distribution of rainfall, irrigation is considered an important principle in agriculture in these areas. Therefore, this research has been conducted in order to investigate the quality of underground water in parts of the north and center of Kerman province for agricultural consumption. In this study, there are 534 water samples from 8 cities (Kerman, Zarand, Bam, Bardsir, Jiroft, Baft, Faryab and Rafsanjan). Groundwater was collected from different sources and the concentration of Na+, Ca+2, Mg+2, Cl-, SO4-2, HCO3-2 ions was analyzed. Also indicators such as Total Dissolved Solids , Sodium Absorption Ratio, Permeability Index, Residual Sodium Bicarbonate , Electrical Conductivity, Salinity Potential,Magnesium Hazard , Hardness water , percentage of sodium soluble in water was determined and evaluated. After determining the quality characteristics of water, the results were compared and interpreted with water standards for agriculture. In this study, AqQA software was used to draw graphs to investigate and compare water characteristics. Based on the results, more than 37% of the studied resources are classified as unsuitable (salinity above 2 ds/m) waters in terms of salinity. Among the studied cities. Zarand and Rafsanjan cities are in unfavorable conditions in terms of groundwater quality indicators, so that EC, SAR, PS, TH, SSP and MH are in critical conditions in one or both of these cities, and most areas In terms of agricultural water standards, the other provinces that have been examined in this study have good quality water. The combined type of underground water in all areas is Ca-Mg-SO4-Cl. So that in the more northern cities of the province, such as Rafsanjan, Zarand, Bardsir, as well as Bam and Kerman, the predominant anion of water is chlorine, while in Faryab, Baft and Jiroft, the status of the predominant anions of the water is slightly towards sulfated. In the water sources studied in most of the cities, Na+Mg+2Ca+2 is the dominant anion of chlorine, and little bicarbonate is observed compared to other anions in the water samples. Also, based on the results, the dominant water surface in all areas are Na-Cl and Mg-Cl so it is necessary to use the water with proper management and choose the appropriate plant according to their chemical conditions. |