As big as you can get is how I feel. Since a good part of what you plow with your harrow is on top aka above the surface (undisturbed dirt prior to tillage), I don't like the axles limiting my ability to cut as deep as possible. Getting the 20 give or take dishes solves that problem. 6" is where I like to go, below the surface when/if I can.
For a follow up I use a JD chisel harrow with shanks on 9" centers and 10" sweeps. Attached to that are 3 rows of spring fingers. I have posted pics of it on here in the past. It's home made in that I added the spring fingers for the smoothing effect and saves a trip with the spike harrow.
This makes for 2 passes and you go from dormant dirt to a prepared seed bed ready to drill.
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Today's Featured Article - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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