1 Kings 18:32 - Ellicott's Commentary On The Whole Bible

Measures. — The “measure,” the third part of the ephah, hence also often called shalish (a “tierce,” or “third”), was something less than three gallons. A trench to contain only six gallons seems too insignificant for the context; hence it is supposed that the sense is “large enough for the sowing (as in a furrow) of two measures of seed.”