For example Fredlund and Rahardjo (1993) presented this relation: π=31.92*EC^1.08. is there any other relation?
The short answer is: π = -RTcs.
The long answer can be found in one of the boxes in chapter 3 in Lambers, H., Chapin, F.S. III & Pons, T.L. 2008. Plant Physiological Ecology. 2nd edition. Springer, New York.
I attach a PDF of those boxes for your perusal.
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