Disc Harrow?
What size?
What is the lift capacity of your Three Point Hitch?
Is your tractor 2-WD or 4-WD?
Is your intention to smooth a field after plowing for a crop?
Is your intention to establish game food plots and/or maintain fire breaks?
Nebrfarmr
Veteran Advisor - Successful Farming
09-22-2011
Re: Disc spacing
We have both a 9" and 7 1/2" spaced disk, both are older IH disks, so they are built similarly.
9" spacing - goes deeper, pulls just a little easier for the depth you are going, doesn't plug. Usually with the wider spacing, you go with bigger blades. Chops through heavier residue easier.
Better for going deep, and burying some stalks.
7-1/2" spacing - smoother seedbeds, doesn't make as big of clods if the ground is a little wet, cuts stalks into smaller pieces, but will plug sooner in heavy trash. In wet conditions you better be sure the scrapers are in A-1 shape, at least on our soils. One pass with it on bean ground leaves the ground as smooth as 2 passes with the 9" spaced one. However, in heavy cornstalks, and deep ridges, it is hard to get it down deep enough to chop the stalks in the bottom of the ridge all the way through in tough conditions.
jeff9366
1/31/2019
Disc/Pan Spacing
My primary Disc Harrow objectives involve CUTTING; opening new game feed plots, maintaining vegetation free fire breaks and vegetation control along woodland trails. Harrow weight on 16 discs, rather than 20 discs, puts more cutting weight on each disc. Spacing between discs is 9". If you have rocky soil, 9" disc spacing will collect fewer rocks.
Tractor users with SMOOTHING (plow furrows) as their priority may consider the 20/18 or 20/20 configuration. Both have 7-1/2" spacing between discs.
Disc Harrows are available with two types of discs: notched and smooth. Notched discs cut pasture grass and crop stubble better; in open soil notched blades jerk out trash, meaning vines and tree roots, which sporadically stick in the notches. Smooth discs roll over some vegetation that notched discs cut through.
You have Ferguson incorrectly spelled.