تقييم جودة المياه الجوفية ومدى ملاءمتها لأغراض الري وتأثيرها على التربة بمدينة غريان / ليبيا

This study aims to Evaluation of groundwater quality for irrigation purposes، and its effect on the soil in the Gharian City Libya، located in northwestern Libya. Groundwater is considered the main source on which the population depends to meet its needs. The area contains a number of springs and underground wells Public and private water sources are used for drinking and irrigation purposes Information was gathered and field visits were conducted during this process, 16 samples were selected from a number of wells and Chemical analyses were performed on it to determine the concentrations of a number of positive and negative ions and to measure pH, electrical conductivity, and total dissolved salts Through it, some indicators that contribute to the evaluation of irrigation water were calculated these include the use of the American Salinity Laboratory classification scheme, sodium absorption rate (SAR), sodium percentage (Na%), permeability index (PI), Kelly ratio (KR), permeability index (PI), and magnesium hazard. The results obtained compared with standard criteria showed that the water of these wells is classified as high salinity and low sodium (C3 S1). The study concluded that well water can be used to irrigate soils with good porosity and permeability and causes problems for soils with low permeability and increases the accumulation of salts in them. Therefore, it needs special management, a good drainage system, and the cultivation of salt-tolerant plants. Keywords: Groundwater, soil salinity, permeability index, irrigation water.