Abstract
Water samples from 36 hand pumps (13-20 m deep) and 76 tube wells (30-40 m deep) were collected from Daska. Faisalabad and Multan Tehsils during 1998 and 1999. These samples were analysed for EC, soluble ions. and then total soluble salts. sodium adsorption ratio (SAR), residual sodium carbonate (RSC) and the ionic strength (I) were computed. The EC. SAR. RSC and I ranged from 0.24 to 5.97 dS m', 0.86 to 22.08 (mmoVL)II2.0.0 to 6.4 mmol.L" andO.Om to 0.083 mol L-J respectively. Regression model "I=O.00049 + 0.0 129EC" was computed with correlation coefficient (r) value ofO. 997**. It is concluded that 1==0.013EC can safely be followed for estimating the I from ground water EC in the Punjab. Pakistan. Key words: ground water, ionic strength. regression. SAR prediction
