Agricultural implement

A plough implement comprising a main frame and a plurality of first ground engaging tools, wherein the plough implement is a reversible plough, the main frame supports the plurality of first ground engaging tools, and the plough implement comprises a depth adjustment apparatus configured to move at least a first ground engaging tool of the plurality of first ground engaging tools with respect to the main frame to enable adjustment of a working depth of the first ground engaging tool;

• wherein the depth adjustment apparatus comprises a four-link parallelogram linkage connecting the main frame to the first ground engaging tool, the four-link parallelogram linkage comprises a first pivotable link, a second pivotable link, and a coupler link, the first ground engaging tool is coupled to the coupler link, the first pivotable link is pivotally coupled to the main frame via a first pivot and to the coupler link via a second pivot, the second pivotable link is pivotally coupled to the main frame via a third pivot and to the coupler link via a fourth pivot, and the first pivot and the third pivot are offset from one another along a longitudinal axis of the main frame;
• and
• wherein a first length of the first pivotable link is equal to a second length of the second pivotable link, and a first distance between the first pivot and the third pivot is equal to a second distance between the second pivot and the fourth pivot to enable the depth adjustment apparatus to maintain an orientation of the first ground engaging tool with respect to a ground surface while moving the first ground engaging tool relative to the main frame.