Getting Down to Earth 11 Added Salt Percent by Weight of Moisture Resistivity, (Ohm-cm) 0.0 10,700 0.1 1,800 1.0 460 5.0 190 10.0 130 20.0 100*For sandy loam; moisture content, 15% by weight; temperature 63º F (17º C)Table IV: Effects of Salt Content on Earth Resistivity* Moisture Content, Resistivity (Ohm-cm) Percent by Weight Top Soil Sandy Loam 0.0 1,000 x 106 1,000 x 106 2.5 250,000 150,000 5.0 165,000 43,000 10.0 53,000 22,000 15.0 21,000 13,000 20.0 12,000 10,000 30.0 10,000 8,000*From “An Investigation of Earthing Resistance” by P.J. Higgs, I.E.E. Journal, vol. 68, p. 736, February 1930Table III: Effect of Moisture Content on Earth Resistivity*
