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ABSRTACT
This paper highlights the regional variation in total hardness, electrical conductivity, potential salinity and saturation index of groundwater in Nigeria. The total hardness ranges from 25 ppm to 200 ppm increasing from south to north of the country. The electrical conductivity ranges from 10 to 1,000 μUmhos/cm while the potential salinity is generally less than 3, hence a wide range of crops ranging from tolerant to semi tolerant can be grown in Nigeria. The saturation index of Nigerian groundwater ranges from -5 to 4.5.