Hard pan

Also found in: Medical, Acronyms.
the hard stratum of earth lying beneath the soil; hence, figuratively, the firm, substantial, fundamental part or quality of anything; as, the hard pan of character, of a matter in dispute, etc. See Pan.

See also: Hard

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
This tractor can break hard pan, achieve uniform depth, and break soil clods.
Experts, however, added that hard pan field was not suitable for maize cultivation.
* Pockets of soil that do not represent the majority of the block (random sand pockets, or hard pan).
Puddling results in completely breakdown of soil aggregates destruction of macro pores and formation of hard pan at shallow depth which favours Dry-DSR.
The ground conditions were primarily cobble and hard pan dirt, a combination that could lead to difficult boring if done improperly.
The presence of hard pan had negative impact on soil bulk density, soil nutrient status, penetration resistance and soil porosity which directly or indirectly affects the yield of crops by decreasing soil porosity and increasing soil bulk density (Ahmad et al., 2009).
Clay soils, while nutritionally rich, tend to be the worst drained, with a hard pan beneath the surface usually caused by excessive vehicle or foot traffic, all too familiar in new gardens after the builders have left.
Then the cellar hole to a house that had already been moved had to be filled with ties, and excavation for the home's new foundation had to be dug deeper than expected to reach hard pan.
Rotovators leave a hard pan about four inches or so down underground which impedes natural drainage so don't rotovate too often without deep digging beforehand.