I used to design high residue cultivators. They would pop out the weeds, not disturb the residue, loosen the soil, and you could do this at 8-9 mph.
I think Hiniker might be the only one still making that type of cultivator. - http://www.hiniker.com/ag_products%20new/6000_cultivator.html
I will warn you that it takes a real tractor to run that type of cultivator. You are not going to do it with a 3020 JD. It will take something with at least 180 HP to pull a 12 row cultivator.
I remember seeing a piece of literature from Deere that said cultivating increases yields 10-15 bu/acre, even if you don't have a weed problem. Seems like increasing your income $50+/acre would be worth it, but most farmers now would rather go boating in the summer rather than tend their crops.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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