Agricultural trench depth systems, methods, and apparatus

An agricultural row unit, comprising:

• a row unit frame having an upper surface with depth adjustment slots therein;
• a furrow opening disc rotatably supported by said row unit frame, said furrow opening disc configured to open a furrow in a soil surface as the row unit frame advances in a forward direction of travel;
• a gauge wheel arm pivotally supported at a proximal end from said row unit frame;
• a gauge wheel rotatably supported on a distal end of said gauge wheel arm, said gauge wheel disposed adjacent to said furrow opening disc such that said gauge wheel is displaceable with respect to said furrow opening disc;
• a depth adjustment assembly, comprising:
• a depth adjustment body pivotally connected via a pivot to said row unit frame, said depth adjustment body having an upper end and a lower end, said lower end engaging with said gauge wheel arm to limit pivotal movement of said gauge wheel arm in an upward direction away from the soil surface;
• at least one gear wheel operably connected with said upper end of said depth adjustment body, said at least one gear wheel including teeth that engage with said depth adjustment slots in said upper surface of said row unit frame;
• an actuator configured to rotatably drive said at least one gear wheel along said depth adjustment slots in said upper surface of said row unit frame, whereby rotation of said at least one gear wheel along said depth adjustment slots causes movement of said depth adjustment body about said pivot to vary a depth of penetration of the furrow opening disc into the soil surface by limiting an amount of upward displacement of said gauge wheel with respect to said furrow opening disc.