La acción se llama "disking", se usa para romper el terrón.

Referencia: my garden

fotos:
http://images.google.com/images?hl=en&lr=&ie=UTF-8&oe=UTF-8&...

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... The proposed federal action is the use of prescribed fire; tree/shrub removal; mowing;
hydro axing; disking; plowing; seeding cereal grains, legumes, native ...
www.fs.fed.us/r9/shawnee/scoping/ openlands/openlands.pdf - Similar pages

Returning CRP Land to Crops: Warm-Season Grass Management/ ...
... Disking before plowing made plowing easier and produced smaller clods
that could be more easily handled with secondary tillage. ...
www.ianr.unl.edu/pubs/soil/nf343.htm - 14k - Cached - Similar pages



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Note added at 17 mins (2003-11-06 15:55:12 GMT)
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el \"plow disk\" o \"plow disc\" es parte del \"disk plow\" o \"disc plow\"

Agricultural Collection - Alberta Community Development
... 1920 Johnson\'s automatic pickler. Plow Disk. n/a Massey-Harris No. 3 Disk Plow;
n/a Massey Harris Great West #2 gang plow; n/a Cockshutt New Rotary Disk Plow; ...
www.cd.gov.ab.ca/.../site_listings/reynolds_alberta_museum/ agriculture/Collection/index.asp - 43k - Nov 4, 2003 - Cached - Similar pages

[DOC] ---------------------------------------------------------------- ...
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... 25°. For non-adjustable plow disc blades, the tilt angle shall be
set at 18 to 20°. 4 Classification. One-way Disc Plow. Tractor ...
www.bar.gov.ph/.../aug2002/Standards 2000/Standards for Pro... PAES121-DiscPlow.doc - Similar pages