These plows were used in Europe and brought to the New World. They found their way into the grassland prairies after John Deere invented a one-piece plow-share. They typically bury 90-95% of the residue on each trip. These plows turn the surface soil upside down leaving only 5-10% surface residues.
These plows are commonly used around the US, they bury 80-90% of the residue with each trip, leaving only 10-20% surface residues.
The "arms" raise for transport, and lower for use.
These plows are residue friendly, leaving 70% or more of the residues on the soil surface. The spacing of the chisels and speed of the tractor determines the actual amount.
These plows are used to break through compacted tillage zones to improve water infiltration and root penetration. These plows are usually on wide centers (~1m) and maintain 90% or more surface residues.
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Sometimes called the plow that saved the Plains. These plows undercut the materials on the surface and maintain 90-95% of the residues at the surface. When smaller sweeps are used, more residues are buried.
These small chisels have other attachments behind them to detach undercut plants. They also bury more residue.