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.
Effect of subsurface drainage on water balance and water table in poorly drained paddy fields
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.
Prototype rice transplanter masters the paddy with machine vision
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