Abstract
Thirty-Three salt affected soil samples were collected from three experimental stations follows to Agricultural research center in Sebha city and they were used to cover a wide range of salinity in order to calculate the values of ESP through the results of laboratory analysis and through the use of mathematical equations proposed by Richard, 1954 and Balba, 1962. The results obtained from this study shown that the difference between the values of ESP obtained by the two methods mentioned above at 0.05 significant level, statistically was not significant. Therefore, we confirm that the validity and possibility of using these two equations referred in this study to calculate the ESP of salt affected soils in experimental stations in Sebha city.