Concept:
A furrower is an agricultural implement used for opening furrows and forming ridges.
Step 1: In ridge formation, soil must be cut and moved to both sides.
Step 2: A furrower has wings or working surfaces that turn soil in opposite directions.
Step 3: As the implement moves forward, it opens a furrow and forms ridges on both sides.
Step 4: It is useful for crops that require ridge and furrow planting.
Step 5: Therefore, the implement is called a furrower.
\[
\boxed{\text{Furrower}}
\]