A NEW METHOD TO ESTIMATE TOTAL DISSOLVED SALTS IN SOIL SATURATUION EXTRACTS FROM ELECTERICAL CONDUCTIVITY UNDER EGYPTIAN CONDITIONS | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 12, Volume 34, Issue 5, May 2009, Page 5649-5657 PDF (484.56 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2009.93121 | ||||
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| Authors | ||||
| M. H. El-Sayed; M.M.I. El-Kholy | ||||
| Soil, Water and Environment Res. Inst., Agric. Res. center, Giza, Egypt | ||||
| Abstract | ||||
| Fifty two soil samples with different quantities and qualities of salt were taken from different places in Egypt to present the most soil types. A saturation extract from each sample was prepared and its electrical conductivity (EC) and total dissolved salts (S) were determined. Both EC and S values ranged from 0.74 to 185 dSm-1 and from 0.44 to 309 g dm-3, respectively. The relationship between S and EC was not linear. When the saturation extracts were diluted with progressively large quantities of distilled water [1(saturation extract):10, 25, 50, 100, 250, 500, 1000 (distilled water)] and their electrical conductivity were calculated (ECe) with the equation: ECe =(ECd –ECw)F, where ECd and ECw were the conductivity of the diluted extract and the distilled water, respectively, and F was the dilution factor, the relationship between S and ECe tended to be linear. The highest linear correlation coefficient relating S (mg dm-3) and ECe (dS m-1) was reached when ECe values were calculated for dilution with an electrical conductivity (ECd) between 0.1 and 0.5 dSm-1 (ECe*). The regression equation was S=425 ECe* with R2=0.989. This relationship can be used in all saturation extracts, regardless of the concentration and type of ions present. | ||||
| Keywords | ||||
| Soil saturation extract; total dissolved salts and electrical conductivity | ||||
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