plow sole

plow sole

[′plau̇ ‚sōl]
(geology)
A pressure pan representing a layer of soil compacted by repeated plowing to the same depth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Typically, it promotes the formation of a layered profile consisting of a slurry-like puddled top soil layer, a hydraulically less-conductive middle layer (also, called plow sole), and a less compact subsoil layer below the plow sole.
The surface of a paddy field is a plane, however the plow sole on which the transplanter actually drives is bumpy, and the transplanter's front tires are often forced into unwanted directions by hard, muddy soil.