Which plough attachment is a miniature plough bottom that cuts a narrow shallow furrow ahead of the shin and moves trash and roots into the main furrow so the mouldboard covers them completely?
A jointer is a small auxiliary plough bottom that turns the upper strip of soil and surface trash into the furrow before the main bottom passes, improving burial. A coulter primarily makes a vertical cut; a subsoiler works deeply below the normal plough layer. The described attachment is the **jointer, A**.
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