The selection of type of points or blades is important to accomplishing what the grower is aiming for in regard to weed control, residue management and seedbed preparation, according to the Tillage Equipment Pocket Identification Guide published by the Natural Resources Conservation Service. For example, the less inversion action the point or shovel creates, the less residue is buried.
Sweeps and spike points bury less residue than do straight points or twisted points. Slower speeds and shallower operating depths usually leave more residue.
A variety of types and sizes of chisel points can be utilized when tilling soils. Among these are: A. 2 inch reversible pike point; B. 2 inch reversible straight chisel point; C. 3 inch right and left twisted shovels points; D. 4.5 inch reversible shovel; E. 8 or 10 inch shovels; 12, 14, 16 or 18 inch sweeps.
A subsoiler is typically designed to penetrate 12-22 inches deep to alleviate soil compaction. Subsoiling is often used to loosen compacted areas of fields where heavy loads have passed. The amount of disturbance will depend upon the shape of the shank and the working angle of the tool bar.
Types of subsoiler shanks include: A. straight, B. parabolic and C. bent leg.