High speed row crop cultivator

A row crop cultivation unit having a unit frame adapted to be connected to a tractor mounted tool bar by a parallel linkage that permits vertical movement of the unit frame relative to the tool bar;

• a gauge wheel mounted on the unit frame for controlling the unit frame height relative to soil being cultivated;
• a disk coulter journaled on a bell crank that is pivotally attached to the unit frame;
• a link, attached to the bell crank and the unit frame, having a lost motion joint with a spring bias that permits the disk coulter to move upward relative to the unit frame;
• and
• an earth working tool supported by the unit frame to the rear of the disk coulter.

A middleworker, for a row crop cultivator including:

• a shank attachment bar with a nose plate portion;
• a generally triangular horizontal plate secured to the bottom of the shank attachment bar;
• a first share attachment flange integral with the generally triangular horizontal plate;
• a second share attachment flange integral with the generally triangular horizontal plate;
• a subsoil point attached to the nose plate portion and extending downward and forward to a position forward of and below the generally triangular horizontal plate;
• and
• a share clamped to each said share attachment flange and extending outwardly and rearwardly from a position adjacent to a side of the subsoil point.