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Soil Electrical Conductivity Map Variability in Limestone Soils Overlain by Loess

^a Dep. of Agron., Univ. of Kentucky, N-122 Agric. Sci. North, Lexington, KY 40546-0091
^b Dep. of Biosyst. and Agric. Eng., Univ. of Kentucky, 218 C.E. Barnhart, Lexington, KY 40546-0276
^c John Deere Agric. Manage. Solutions, John Deere and Co., 4140 NW 114th St., Urbandale, IA 50322

View larger version (38K): [in a new window]   Fig. 1. Veris Technologies 3100 soil electrical conductivity (EC) mapping system. Adapted from Veris Technologies (2002) with permission.

View larger version (20K): [in a new window]   Fig. 2. Temporal semivariograms for shallow (ECshallow) and deep (ECdeep) electrical conductivity at the Fayette-1 experimental site.

View larger version (18K): [in a new window]   Fig. 3. Semivariogram for shallow (ECshallow) and deep (ECdeep) electrical conductivity with semivariance as a function of the coulter depth lag.

View larger version (32K): [in a new window]   Fig. 4. Shallow electrical conductivity (ECshallow) 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).

View larger version (24K): [in a new window]   Fig. 5. Shallow (ECshallow) and deep (ECdeep) electrical conductivity vs. depth to fragipan and rock.

View larger version (31K): [in a new window]   Fig. 6. Histograms for deep electrical conductivity (EC) at the Hardin location.

View larger version (83K): [in a new window]   Fig. 7. Shallow electrical conductivity (EC) maps at the Hardin county location with data from four different dates and created with three mapping techniques: (a) point maps with equally spaced contour intervals, (b) point maps with contour intervals having the same number of points within each class, and (c) interpolated maps created with kriging (exponential semivariogram models) and with equally spaced contour intervals.