Abstract
Fifty tubewell (deep) and forty four hand pump (shallow) water samples from Faisalabad Ustriet were anlysed for electrical conductivity, total dissolved salts and soluble cations and anions, Electrical conductivity of 44 per cent of the tubewell and 6.8 per cent of the hand pump waters was less than 0.750 d.Sm-1 (had low salinity hazard), and could be used for irrigation without spe-cial management practices. Sodium adsorption ratio of 76 per cent of the tubewell and 36 per cent of the hand pump waters was less than 10 and had low sodium hazard. Precipitation index was positive for all water samples indicating that calcium carbonate will tend to precipitate from soil solution and increase the Nai (Ca+ Mg) ratio. Out of 50 tubewell and 44 hand pump water samples studied, 74 per cent of the tubewell and 90,9 prrcent of the hand pump waters had conversion factor from electrical conductivity d Sm-1 to parts per million between 650 and 775, the average of these water sam-ples being 709 and 712, respectively. The average factor for con-verting the electrical conductivity in dSm- X to parts per million of the soluble salts for 82% of the water samples studied came to 710.
INTRODUCTION
Quality of irrigation water is an extremely important factor for pla-ning a permanent irrigation project. The total dissolved salts, the main criterion used for determining the salinity class of water, were previously estimated by gravimetric methods which are time consuming and laborious: Electrical conductivity measurements to assess total soluble salts being simple, rapid and precise, has become popular. The electrical conductivity
