A zone tillage tool comprises a tool frame connected by a parallel liftlinkage to a tool bar. A fall tillage coulter or dual spring tillage coulterscan be carried on the tool frame in advance of a pair of containment coulters.The fall tillage coulter tills soil in a zone that is approximately 7 to 9inches deep while the spring tillage coulters till 2 to 3 inches deep. Thefall tillage coulter includes a plurality of shovel bits located around thecircumference thereof at a forward rake angle. The tip of each shovel bit hasa generally vertical entry position into the ground due to the forward rakeangle. As the fall tillage coulter rotates, the shovel bits rotate around andexit the soil in a generally horizontal position, thereby lifting andloosening the soil without compacting the soil through a series of rearwardlyand upwardly directed soil scooping actions.
