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hardpan

n. 硬质地层,粘土层,砂砾层

硬质地层,粘土层,砂砾层

WordNet (r) 3.0 (2006) (WordNet)

hardpan
n 1: crust or layer of hard subsoil encrusted with calcium-
carbonate occurring in arid or semiarid regions [synonym:
{caliche}, {hardpan}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Hardpan \Hard"pan`\ (h[aum]rd"p[a^]n), n.
The hard substratum. Same as {Hard pan}, under {Hard}, a.
[1913 Webster]

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What Is A Hardpan In Soil: identification, removal and prevention
Hardpan soil close to the surface may prevent plants from growing in the area because their roots cannot penetrate the hardpan, and the hardpan soil does not contain the water and nutrients plants need to grow Agroconection breaks hardpan soil down into five types Caliche This hardpan soil can be found in the Southwest and is the result of
What is Hardpan and How to Breaking Up Hardpan Soil | Facts About Soil
Hardpan is a cemented layer in the soil, usually from 2 to 4 feet under the surface, although erosion can wash away some of the soil that covers it, or even expose it on the surface What Causes Hardpan Hardpan soil can be man-made or caused by soil composition It is formed chemically, by lime, iron or silicate materials depositing at the

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