4 adjectives to describe subsoil

His success was not large with it at any time, for the Mount Vernon soil was not naturally suited to alfalfa, which thrives best in a dry and pervious subsoil containing plenty of lime, but the experiment was certainly worth trying.

CAROLINA, NORTH, one of the original 13 States of N. America, on the Atlantic, about the size of England, S. of Virginia, 480 m. from E. to W. and 180 m. from N. to S.; has a fertile, well-watered subsoil in the high lands; is rich in minerals and natural products; the mountains are covered with forests, and the manufactures are numerous.

In short, the young farmer can scarcely have a safer rule than thisto subsoil his land first, whenever there is a doubt of the soundness of the subsoil, or a fear that by bringing it to the surface, the fertility of the upper soil will be diminished.

The camp is liable to be pitched and the men required to sleep in malarious spots, or on the damp earth, or over a wet subsoil, exposed to noisome and dangerous exhalations from which disease may arise.

4 adjectives to describe  subsoil