Artificial neural network (ANN)
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            Sodium adsorption ratio (SAR)
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            Tigris river
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            Water quality.
                                                        
                                                                                                                                                                                         
                                                                        
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                                        Sodium adsorption ratio (SAR) is considered as a measure of the water suitability 
for irrigation usage. This study examines the effect of the physicochemical 
parameters on water quality and SAR, which included Calcium(Ca+2), 
Magnesium(Mg+2), Sodium (Na+), Potassium (K), Chloride (Cl-), Sulfate(SO4-2), 
Carbonate (CO3-2), Bicarbonate (HCO3-), Nitrate (NO3-), Total Hardness (TH), 
Total Dissolved Salts (TDS), Electrical Conductivity (EC), degree of reaction 
(DR), Boron (B) and the monthly and annually flow discharge (Q). The water 
samples were collected from three stations across the Tigris River in Iraq, which 
flows through Samarra city (upstream), Baghdad city (central) and the end of Kut 
city (downstream) for the periods of 2016-201
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