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Apparent profile soil electrical conductivity (EC_a) can be an indirect indicator of a number of soil physical and chemical properties. Commercially available EC_a sensors can be used to efficiently and inexpensively develop the spatially dense data sets desirable for describing within‐field spatial soil variability in precision agriculture. The objective of this research was to compare EC_a measurements from a noncontact, electromagnetic induction–based sensor (Geonics EM38)¹ to those obtained with a coulter‐based sensor (Veris 3100) and to relate EC_a data to soil physical properties. Data were collected on two fields in Illinois (Argiudoll and Endoaquoll soils) and two in Missouri (Aqualfs). At 12 to 21 sampling sites in each field, 120‐cm‐deep soil cores were obtained for soil property determination. Depth response curves for each EC_a sensor were derived or obtained from the literature. Within a single field and …