Abstract
Cone index profiles taken in several Southeastern U.S. fields with upland soils were used to measure the hardpan depth and to predict their spatial variation. Continuous treatments of these fields for several years included conventional tillage, no-tillage, segregated traffic, and random traffic. Conventional tillage systems were found to bring the hardpan significantly closer to the soil surface, even in no-trafficked row middles and directly beneath the rows. Little difference in depth of hardpan was found between a no-till field subjected to random traffic and a field where traffic was segregated. The least amount of variation in hardpan depth was found in trafficked row middles in a no-till field.
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