He took also of the seed of the land, and planted it in a fruitful field; he placed it by great waters, and set it as a willow tree. The seed of the land - Zedekiah, brother of Jehoiachin.
Planted it in a fruitful field - Made him king of Judea in place of his brother.
Placed it by great waters - Put him under the protection of Babylon, situated on the confluence of the Tigris and Euphrates.
And set it as a willow tree - Made him dependent on this city of great waters, as the willow is on humidity.