Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
hardpan .
Etymologies
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Examples
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Soils from argillite are clayey, poorly drained, and have hardpans in lower horizons.
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On poorly drained, clayey soils with hardpans that were derived from argillite, native vegetation is a mosaic of red maple, swamp hardwoods, and mixed oaks, including pin oak.
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In monitoring the moisture on many field crops, the primary rooting system may be assumed to be from one to two times the crop height, or to the depth where hardpans or other obstacles are encountered.
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In some areas, tractor-drawn sub-soilers (long narrow shanks that penetrate down to 60 cm) are used in an attempt to break up deep hardpans
Chapter 8 1981
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"Most soils have some sort of impeding layer below 4 or 5 feet (clay layers or hardpans) that would further prevent such deep root growth," he added.
SFGate: Top News Stories Pam Peirce 2010
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Wind erosion indicators are formation of fall dunes, blocking of highways, dust storms, nebkha features, reduction of waterways capacity due to deposition of sand, exposure of hardpans at the surface, and gravel lag.
innovations-report 2009
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