Answer:

hardpan

Answer	Crossword Clue
HARDPAN	Firm soil
HARDPAN	Bedrock
HARDPAN	Subsoil layer

HARDPAN	Firm, dry ground
HARDPAN	Compact soil layer
HARDPAN	Firm layer of clay underlying soft soil.
HARDPAN	Rock bottom.
HARDPAN	Solid foundation.
HARDPAN	Bedrock.
HARDPAN	Solid, unplowed land.
HARDPAN	Solid base.

HARDPAN	Type of subsoil.
HARDPAN	Clay layer under soil
HARDPAN	Drainage impairer