and over them that did the work of the field for tillage of the ground was Ezri the son of Chelub:

Ezri son of Chelub was in charge of the workers in the fields who tilled the soil.

and over workmen of the field for the service of the ground is Ezri son of Chelub;

And over them that worked in the field for tillage of the ground was Ezri the son of Chelub.