Evaluation of Groundwater Quality Trend for Agricultural usage in Ajabshir Plain

Due to importance of groundwater resources for drinking and agricultural water supply, monitoring of quality and analysis of spatial and temporal changes of water quality is an important issue in the programming and management of water resources. In this study groundwater quality trend in Ajabshir plain was evaluated with the Spearman teas for both dry and wet seasons during the 2002-2012 time period . Water quality parameters such as SO4, Na, Cl, EC, SAR, and TDS were analyzed and quality was classified using the Wilcox diagram. The results of this study revealed that the water quality has been declined over the time period and water resources of the plain were mainly classified as inappropriate for agricultural usage. The analysis of variables trend showed a significant positive trend of SAR and EC in the Alenjiq well. Electrical conductivity has a decreasing trend in Danalo and Qobadlo wells which indicates the decreasing of the salinity in these wells. Due to the water quality and quantity decline in the plain during the past decade, watershed management practices are suggested to sustainability of the water resources.