What is "to rib land"

Rib \Rib\, v. t. [imp. & p. p. Ribbed; p. pr. & vb. n. Ribbing.]

1. To furnish with ribs; to form with rising lines and channels; as, to rib cloth.

2. To inclose, as with ribs, and protect; to shut in.

   It [lead] were too gross To rib her cerecloth in the obscure grave.
   --Shak.

   To rib land, to leave strips of undisturbed ground between the furrows in plowing.