Patent ID: 7017675

Claim:
In a tillage machine, the improvement comprising: a mobile frame; a group of flat residue cutting coulters extending across the path of travel of the machine and supported on the frame for rotation about transverse axes of rotation; a group of deep tillage shanks extending across the path of travel of the machine and supported on the frame behind said coulters for fracturing the subsoil and creating furrows behind the shanks with ridges containing chunks of soil on opposite sides of the furrows; and multiple rows of individually mounted, rotatable, laterally spaced, concavo-convex discs extending across the path of travel of the machine and supported on the frame behind said tillage shanks for pulverizing the chunks, leveling out the ridges and furrows, and mixing residue into the soil, said deep tillage shanks being devoid of sweeps and having lowermost points adapted to run at depths substantially below the discs without overlapping one another in a transverse direction across the path of travel of the machine.