Fig. 6. Relationships between apparent soil electrical conductivity (EC_a) data for (top) Missouri field GV and (bottom) Illinois field WS. Relationships appear more linear for WS (40°18'5'' N, 88°32'38'' W; Varna, Drummer, and Chenoa soils) than for GV (39°14'5'' N, 92°8'49'' W, Mexico and Adco soils). EC_a-sh, shallow (0–30 cm) EC_a measured by Veris 3100; EC_a-dp, deep (0–100 cm) EC_a measured by Veris 3100; EC_a-em, vertical-mode EC_a measured by Geonics EM38.

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