Fig. 4. Shallow electrical conductivity (EC_shallow) vs. soil moisture, clay, Ca, and depth to argillic or cambic horizons for four locations. The solid circles indicate the first and open circles the second date for each location listed in Table 2 under the Transect EC Measures column. The coefficient of determination (r²) is given for simple linear regressions. The data used for the regression relationship between EC and depth to argillic or cambic horizon only include those observations where the depth to argillic or cambic horizon was <50 cm (solid circles).