Agriculture land
                                                        
                                                                                                            
                                                            Trace elements
                                                        
                                                                                                            
                                                            Irrigation wastewater and well water
                                                        
                                                                                                            
                                                            Water quality indices
                                                        
                                                                                                                                                                                         
                                                                        
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                                        Erbil city is located in the northern Iraq with a population of over one million people. Due to water crises farmers usually use wastewater and well water for the agricultural production. In this study six stations were designed to sample waste water and three from well water to define waste water and ground water characteristics. In this study, Residual Na+ Carbonate, Mg++ hazard, salinity hazard, Kelley index, %sodium, total hardness, permeability index, potential salinity, sodium adsorption ratio, and Irrigation Water Quality Index (IWQI) were determined. The order of average cation concentrations in water was Mg2+> Ca2+ > Na+ > K+. While the proportion of main
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