what is the difference?

[yabluko]

"cutting on the ground" and "cutting off the ground"?
what is the difference? The text is about John Deer headers.

thanks!

[alk]

John Deere?
Combine header?
Судя по этому тексту cutting off the ground = cutting above the ground
http://www.google.com/url?sa=U&start=1&q=http://macdon.com/productsupport/pdf/973_HH_974_Flexdraper_manual_225.pdf&e=10384