Re: With all the tillage questions...

Posted by James22 on April 12, 2007 at 12:07:40 from (207.179.239.65):

In Reply to: With all the tillage questions... posted by JoeBob/IN on April 12, 2007 at 09:23:42:

Draft or pull increases exponetially with ground speed, or more particularly, as a function of the speed squared. Consequently small increases in ground speed can result in a significantly higher draft load. The old standard was to use 3.5 mph or above. However caution must be used when adding weight thereby attempting to eliminate wheel slip at these lower speeds; ie, if you "tie" the tractor to the ground, driveline forces can get very high. However some jobs such as field cultivation, need to be done at higher speeds to enhance chemical incorporation or to render a better seed bed. Sometimes running a high horsepower tractor at lower horsepower jobs is not very fuel efficient; eg, pulling a smaller implement at high speeds to use the larger tractor's full horsepower increases the draft so much that you will use more fuel than if you used a smaller tractor at a more moderate speeds. On high draft operations such as moldboard plowing or inline ripping, I size implements so that they can be pulled between 4-5 mph.

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