| 摘要 |
A zone tillage tool comprises a tool frame connected by a parallel lift linkage to a tool bar. A fall tillage coulter or dual spring tillage coulters can 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 9 inches deep while the spring tillage coulters till 2 to 3 inches deep. The fall tillage coulter includes a plurality of shovel bits located around the circumference thereof at a forward rake angle. The tip of each shovel bit has a generally vertical entry position into the ground due to the forward rake angle. As the fall tillage coulter rotates, the shovel bits rotate around and exit the soil in a generally horizontal position, thereby lifting and loosening the soil without compacting the soil through a series of rearwardly and upwardly directed soil scooping actions.
|
