Geochemical Evaluation of Groundwater Quality in Borazjan Plain for Agricultural Purposes

Increased water consumption due to population growth, has a great impact on quality and quantity of water supply. Given this situation, the qualitative and quantitative identification of appropriate resources for a sustainable agriculture seems to be necessary and inevitable. In this study, ground water quality in agriculture Borazjan plain in the north of Bushehr is paid. 21 samples of groundwater plain of ion HCO3-, K, Na, Ca2 , Mg2 , Cl-, SO42-, and NO3- were analyzed. Density of sodium chloride and nitrate ions because of special importance were compared to grades of agricultural water standard. Furthermore the comparison involves parameters such as total dissolved solids (TDS), sodium adsorption ratio (SAR), permeability index (PI), carbonate residue (RC), Electrical conductivity (EC) of ground water quality index (GWQI) were evaluated ,the results stated that, ground water quality in lowland of Borazjan has more EC, sodium and chloride than limit agricultural water standard. Studying the location of underground water quality with respect to the parameters boundaries, it has been determined that underground water quality is average to use for agricultural purposes in the fields. Obtained GQI map shows a value between 68 to 82 percentages for this index, which indicates that the Water irrigation quality in North and Centre of Plains is average and the southern half of the plain has water with suitable quality for irrigation.