Ground openers with common depth-adjustment

A depth-adjustment assembly for adjusting operating depths of a plurality of ground openers of an agricultural implement, wherein the ground openers each include an opening disc, a gauge wheel, and a support assembly securing the opening disc and the gauge wheel to the agricultural implement, wherein the support assembly is configured to raise and lower the ground opener with respect to the ground and/or to adjust a down-pressure of the ground opener, wherein said depth-adjustment assembly comprises:

• for each of the ground openers, a linkage assembly and a depth-adjustment arm configured to adjust a relative position between the opening disc and the gauge wheel, wherein at least a portion of the linkage extends in parallel relationship with the support assembly;
• and
• a laterally-extending common pivot bar, wherein each linkage assembly is secured to said common pivot bar, such that rotation of said common pivot bar is configured to simultaneously adjust the relative position between the opening disc and the gauge wheel of each of the ground openers.