In a mounted disc plough, because there is no landside to take the large lateral side draft force created by the angled spherical discs, the lateral thrust is primarily counteracted by:
Options:
(A) A spring-loaded rear furrow wheel running inclined against the furrow wall
(B) The front steerable wheels of the tractor
(C) The tractor top link draft spring
(D) Increasing tractor forward speed
Answer Key:
A
Step-by-Step Solution & Explanation
- **Disc Plough Furrow Wheel Action:** Unlike mouldboard ploughs that have a flat vertical landside sliding along the furrow wall, disc ploughs lack a continuous landside.
- The large side-force ($F_y$) pushing the plough toward the unploughed land is counteracted by an inclined rear furrow wheel (guide wheel) that bears firmly against the corner of the furrow wall.