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2. Cultivator - Wikipedia

   en.wikipedia.org/wiki/Cultivator

   Cultivators' teeth work near the surface, usually for weed control, whereas chisel plow shanks work deep beneath the surface, breaking up the hardened layer on top. Small toothed cultivators pushed or pulled by a single person are used as garden tools for small-scale gardening, such as for the household's own use or for small market gardens ...

3. Harrow (tool) - Wikipedia

   en.wikipedia.org/wiki/Harrow_(tool)

   Harrows differ from cultivators in that they disturb the whole surface of the soil, while a cultivator instead disturbs only narrow tracks between the crop rows to kill weeds. There are four general types of harrows: disc harrows, tine harrows (including spring-tooth harrows, drag harrows, and spike harrows), chain harrows, and chain-disk harrows.

4. Charles Sherwood Noble - Wikipedia

   en.wikipedia.org/wiki/Charles_Sherwood_Noble

   Charles Sherwood Noble in 1918. Charles Sherwood Noble (1873 – July 5, 1957) invented a minimum disturbance cultivator called the Noble blade. The Noble blade (or Noble plow) cuts weed roots beneath the soil surface without turning the soil over, thus reducing topsoil loss due to wind erosion.

5. Tillage - Wikipedia

   en.wikipedia.org/wiki/Tillage

   Greater speeds, when using certain tillage implements (disks and chisel plows), lead to more intensive tillage (i.e., less residue is on the soil surface). Increasing the angle of disks causes residues to be buried more deeply. Increasing their concavity makes them more aggressive. Chisel plows can have spikes or sweeps. Spikes are more aggressive.

6. Disc harrow - Wikipedia

   en.wikipedia.org/wiki/Disc_harrow

   Disc harrow as part of a chisel plow by Case IH Primary heavy duty disc harrows of 265 to 1,000 pounds (120 to 454 kg) per disc are mainly used to break up virgin land, to chop material/residue, and to incorporate it into the top soil.

7. Spring-tooth harrow - Wikipedia

   en.wikipedia.org/wiki/Spring-tooth_harrow

   Harrows, whether spring tooth, spike tooth or disc harrows can have a drag connection or have a 3 point mounting. A drag harrow is pulled and cannot be backed up. Three point implements can be raised and lowered hydraulicly and maneuvered more easily. A spring-tooth harrow is a type of harrow, and specifically a type of tine harrow. It uses ...