1. 
   Hardpan
   a hard, compacted, often clayey layer of soil through which roots cannot grow.
   Found op http://www.encyclo.co.uk/local/20003
   
   
2. 
   Hardpan
   Compacted soil, sometimes new, created by construction. Water will run off and plant roots can not penetrate the layer. Can be broken up.
   Found op http://www.emilycompost.com/garden_glossary.htm
   
   
3. 
   Hardpan
   A horizon of the soil that is hardened or cemented.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   Hardpan
   Hard'pan` (härd'păn) noun The hard substratum. Same as Hard pan , under Hard , adjective
   Found op http://www.encyclo.co.uk/webster/H/14
   
   
5. 
   hardpan
   <botany, ecology> A very dense soil layer caused by compaction or cementation of soil particles by organic matter, silica, sesquioxides (aluminum and iron) or calcium carbonate, for example. ... (09 Oct 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?hardpan
   
   
6. 
   hardpan
   noun crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=hardpan
   
   
7. 
   Hardpan
   • (n.) The hard substratum. Same as Hard pan, under Hard, a.
   Found op http://thinkexist.com/dictionary/meaning/hardpan/
   
   
8. 
   Hardpan
   In soil science, agriculture and gardening, hardpan or ouklip is a general term for a dense layer of soil, usually found below the uppermost topsoil layer. There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water...
   Found op http://en.wikipedia.org/wiki/Hardpan
   
   
9. 
   Hardpan
   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.
   Found op http://www.physicalgeography.net/physgeoglos/h.html
   
   
10. 
    hardpan
    hardpan, condition of the soil or subsoil in which the soil grains become cemented together by such bonding agents as iron oxide and calcium carbonate, forming a hard, impervious mass. It is disadvantageous to farming, interfering with the circulation of moisture in the soil and with the growth of r...
    Found op http://www.infoplease.com/ce6/sci/A0822706.html
    
    
11. 
    Hardpan
    Hard, usually bare, ground conditions.
    Found op http://en.wikipedia.org/wiki/Glossary_of_golf
    
    
12. 
    Hardpan
    The areas in rough, fairways, or other areas with an exception of hazards, having hard ground, as a result of compacting of the soil is called hardpan.
    Found op http://www.buzzle.com/articles/golf-terminology-glossary-of-golf-terms.html
    
    
13. 
    hardpan
    1) Caliche 2) Dirt 3) Soil
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/hardpan/1
    
    

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