Soil salinity can be determined in the field from measurements of soil electrical conductivity (EC,,). Measurements of depth-integrated EC0 can be made remotely using electromagnetic induction (EM) techniques. A means of determining EC0 for the soil depth intervals of 0 to 30, 30 to 60, 60 to 90 cm, etc., from the EM measurements is needed for salinity appraisal. The EM and EC« measurements were made at about 900 sites in the San Joaquin Valley of California. This large data set was used, along with rigorous statistical techniques, to obtain empirical coefficients used in equations to predict EC0 by depth intervals within the soil profile from EM readings taken above ground. Predictions were found to be more accurate using these new coefficients rather than those previously available. A VALUE of soil electrical conductivity, can be determined from above-ground EM measurements through a depth which depends on the coil orientation, the spacing between transmitter and receiver coils, and the electrical frequency of the USDA-ARS, U.S. Salinity Lab., 4500 Glenwood Dr., Riverside, CA 92501. Received 31 May 1988. "Corresponding author. Published in Soil Sci. Soc. Am. J. 53:74-79 (1989). instrument. Rhoades and Corwin (1981) demonstrated that bulk soil ECa, within discrete depth intervals of the soil profile could be determined from EM readings made at a succession of heights above the ground (e.g., 0, 30, 60, 90, and 120 cm) by solving a set of empirical equations containing depth-specific coefficients. The values of the coefficients utilized in these equations were determined by multiple linear regression analysis of successive EM readings measured with a Geonics EM-38 device (Geonics Limited, Mississauga, Ontario, Can.), and of corresponding ECa values for the soil-depth intervals of 0 to 30, 30 to 60, 60 to 90 and 90 to 120 cm measured using a Martek SCT (Martek Instruments, Inc., Iryine, CA) four-electrode probe (Rhoades and van Schilfgaarde, 1976). A simpler and almost as accurate method was later developed to determine the distribution of ECa within the soil profile using only two EM measurements taken at the soil surface with the long axis of the EM-38 device's electromagnet oriented parallel (EMH) and then perpendicular (EMV) to the soil surface (Corwin and Rhoades, 1982). Equations containing depth-spe1 Product identification is provided solely for the benefit of the reader and does not imply the endorsement of the USDA. Published January, 1989