A plow with a short and quite straight moldboard does not bury manure and turf in the bottom of the furrow so completely as is the case with a long, curved moldboard.
"Crops and Methods for Soil Improvement"
Alva Agee
The long moldboard is preferred in breaking a sod for corn.
"Crops and Methods for Soil Improvement"
Alva Agee
The ordinary breaking plow, characterized by a long sloping moldboard, is the best known implement for breaking all kinds of sod.
"Dry-Farming"
John A. Widtsoe