Jamieson, Fausset and Brown on Isaiah 28:25

25. face--the "surface" of the ground: "made plain," or level, by harrowing.

fitches--rather, "dill," or "fennel"; Nigella romana, with black seed, easily beaten out, used as a condiment and medicine in the East. So the Septuagint, "cummin" was used in the same way.

cast in ... principal wheat--rather, plant the wheat in rows (for wheat was thought to yield the largest crop, by being planted sparingly [Pliny, Natural History, 18.21]); [Maurer]; "sow the wheat regularly" [Horsley]. But Gesenius, like English Version, "fat," or "principal," that is, excellent wheat.

appointed barley--rather, "barley in its appointed place" [Maurer].

in their place--rather, "in its (the field's) border" [Maurer].