I guess this time I'll be clearer and more precise

at wiki hereunder you can find the explanation for tillers and the main one rotary tiller:
http://en.wikipedia.org/wiki/Cultivator

Here we have a Italian producer with different languages available:
http://www.sicma.it/index.php?option=com_content&task=blogca...
fresatrici
tillers


here you can see images of agricultural tillers
http://www.google.it/search?q=agricultural tillers&hl=it&rlz...


Hope the above will also reply to Phil Goddard *neutral* comment made previously.

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Note added at 7 ore (2013-05-13 17:07:14 GMT)
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Moreover, the difference or better the translation required in my view, is the following:
http://en.wikipedia.org/wiki/Tilling
Tilling can mean:
• Tillage (dissodamento) an agricultural preparation of the soil.
to plow/plough = arare
http://en.wikipedia.org/wiki/Plough
The plough (BrE) or plow (AmE; see spelling differences; pron.: /ˈplaʊ/) is a tool (or machine) used in farming for initial cultivation of soil in preparation for sowing seed or planting. It has been a basic instrument for most of recorded history, and represents one of the major advances in agriculture.
The primary purpose of ploughing is to turn over the upper layer of the soil, bringing fresh nutrients to the surface, while burying weeds, the remains of previous crops, and both crop and weed seeds, allowing them to break down.
and I do agree with Rachel

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Note added at 4 giorni (2013-05-18 08:40:30 GMT) Post-grading
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Thank you Nadia. Have a nice week-end.