claypan


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claypan

[′klā‚pan]
(geology)
A stratum of compact, stiff, relatively impervious noncemented clay; can be worked into a soft, plastic mass if immersed in water.
References in periodicals archive ?
sat] values that severely limit downward percolation, such as cemented layers (duripan, petrocalcic), claypans (abrupt increases in clay content) and strongly contrasting particle size distributions.
The preliminary results of the 1997 excavations have provided a clear insight into the structure of the upper claypan deposits, the location of the previous excavations of 1933 and the original well.
A Mexico silt loam soil, typical of Missouri's claypan region, was studies for this research.
No other crops have been successfully cultivated in the region's hard claypan soils.
Occasionally, I drove people to town at night to informal dances held on the claypan near the riverbank camps.
Merchan-Paniagua S (2006) Use of slow-release N fertilizer to control nitrogen losses due to spatial and climatic differences in soil moisture conditions and drainage in claypan soils.
The bracket shows an abrupt clay increase associated with the upper boundary of the claypan in a typical soil profile at SFREC.
His conclusions about the speed of Australian aboriginals 20,000 years ago are based on a set of footprints, preserved in a fossilised claypan lake bed, of six men chasing prey.
To set variable rates for nitrogen, the Missouri scientists experimented with sensors for estimating claypan topsoil depth.
Pengthamkeerati P, Motavalli PP, Kremer RJ (2011) Soil microbial activity and functional diversity changed by compaction, poultry litter and cropping in a claypan soil.
Similarly, in a complex of rock-art shelters, it would be unconventional to record only evidence from one shelter when there were five more within close proximity--and a clinal evidence of stone artefacts between this and a nearby claypan open site.
Comparison of measured and WEPP predicted runoff and soil loss for Midwest claypan soil.