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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

^* Corresponding author (mueller{at}uky.edu)

Received for publication April 23, 2001. Sensors exist that allow rapid mapping of bulk soil electrical conductivity (EC); however, the utility of these sensors for Kentucky producers is unknown. The purpose of this study was to assess the nature and the causes of soil EC variability and to make a first assessment of its potential utility in Kentucky, particularly for fields containing soils derived from limestone residuum overlain by loess. Various geostatistical, correlation, and regression analyses were conducted at seven locations to examine EC map variability. Sensor drift and errors associated with changes in coulter depth were minimal. Bulk soil EC related fairly well with clay content across locations and sample dates (r² = 0.40); however, many site- and time-specific correlations were better. Clay (maximum r² = 0.75), moisture content (maximum r² = 0.76), Ca (maximum r² = 0.67), and Mg (maximum r² = 0.64) were positively correlated with EC, and depth to argillic or cambic horizon (maximum r² = 0.62), depth to fragipan (maximum r² = 0.81), and depth to bedrock (maximum r² = 0.32) were negatively correlated with EC. A multiple-regression model (R² = 0.70) was developed to predict EC that included nine factors: clay, sand, soil moisture, buffer pH, base saturation, Ca, soil temperature, depth to cambic and argillic horizon, and slope. Soil EC variability was spatially structured, and spatial patterns were stable over time; however, the degree to which these patterns could be observed depended on the mapping procedures used. Our research suggested that EC mapping may have utility for Kentucky farmers.

Abbreviations: BpH, buffer pH • BS, base saturation • CEC, cation exchange capacity • DEM, digital elevation model • EC, electrical conductivity • GPS, global positioning system • RSV, relative structural variability

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