Albert Barnes Commentary Jeremiah 14:4

"Because of the ground which is cracked, for that no rain hath been in the land, the plowmen are put to shame, they cover their heads." — Jeremiah 14:4 (ASV)

Is chapt - Rather, is dismayed. “The ground” is used metaphorically for the people who till the ground.

In the earth - i.e., “in the land.”