For Hardpan we have terms and definitions in 5 topics. The topics are Agriculture, Construction, Gardening, Golf and Physical Geography.

A hard, compacted, often clayey layer of soil through which roots cannot grow.
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A compacted layer of soils.
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Compacted soil, sometimes new, created by construction. Water will run off and plant roots can not penetrate the layer. Can be broken up.
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Term given to an area of the golf course (not bunkers or hazards) on which no grass is growing. Shots from hardpan are among the most difficult as it requires a high level of skill to get the club under the ball from such lies.
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Impervious layer found within the soil. It can result from the precipitation of iron, illuviation of clay or the cementing of sand and gravel by calcium carbonate precipitates.
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