Definitionn. crust or layer of hard subsoil encrusted with calcium- carbonate occurring in arid or semiarid regions
Last update: July 10, 2015
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The " buckshot clays " of the backlands, which are so stiff that they can scarcely be ploughed until flooded and softened, and are remarkably retentive of moisture, are ideal rice soil; but none of the alluvial lands has an underlying hardpan, and they cannot as a rule be drained sufficiently to make the use of heavy harvesting machinery possible. [Please select]
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The cost of specially made grubs for digging in hardpan is about $26 per dozen. [Please select]
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_--The excavation of the wells is done by hand, using shovels and picks, and, in the hardpan, special grubs made by A. [Please select]
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"Some engineers specify three rings to be used to each set of lagging below the top set until hardpan is reached, then two rings for each of the remaining sets from hardpan to rock." [Please select]
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