measure salt in soil

Wayne S. Ambler wambler at
Sat Oct 11 13:04:35 EST 1997

My greenhouse soluble salt meter measures salts in ppm, and millimhos.  
Some of the research I've found indicates salt levels in EC units.   
and/or dSm(exponent)-1.  Can someone explain this in high school math 
level terms?  I have not had chemestry and need some help understanding 

One study class the low salt level 3dSm-1, and the high salt level 
10dSm-1.  If the -1 is an exponent, it seems it should be visa 

Thanks. Emily

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