EXPLORING THE POTENTIAL OF NEAR-SURFACE GEOPHYSICAL METHODS TO DELINEATE A SHALLOW HARDPAN IN A SOUTHEASTERN U.S. SANDY COASTAL PLAIN SOIL

摘要

A hardpan, which is a dense soil layer near the ground surface, is an undesirable feature of many soils in the Southeast U.S., especially sandy Coastal Plain soils. Shallow hardpans restrict root growth and water penetration through the soil profile, in turn reducing the effective crop root zone and thereby limiting crop production. Knowledge of hardpan existence, depth, and spatial extent is valuable, and can be used by farmers to improve soil, water, and crop management. This hardpan problem is similar to challenges faced with claypan soils in the Midwest U.S. (i.e., Missouri), where electromagnetic induction (EMI) geophysical methods have been successfully tested by investigators for determining claypan depth and spatial extent. Consequently, near-surface geophysical methods may also supply useful information on hardpan depth and spatial extent.