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Some plants can be left in the ground to keep growing. Check with your local Ag extension service for your location.
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Location: Wapakoneta, OH
I've done it both ways, though for the last several years I haven't done the fall till. You can probably find arguments pro/con for whatever you do...but to be honest I haven't seen any difference. When i did the fall till, it was because I would much the entire garden in the spring after the plants were up with leaves (of which we had plenty at last place). So I'd till the spring leaves into the soil after the garden dies off, then cover it with a fresh new layer of chopped leaves to sit through the winter, of course they got tilled in the next spring. At this place we don't have leaves (never though would miss them, but I do) so i have no reason to till it in the fall.
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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I usually don't do a fall tilling. However I am planning on doing a fall tilling this year. I did not do a spring tilling. My tiller needed a new carb and so I just dug the rows by hand (phew, I got tired just remembering that) and planted. I have a new carb now and will be putting it on soon so I'll want to run the tiller. I have rock walkways between the garden beds and they have accumulated lots of little pieces of twigs and dried leaves, etc. I'm going to run a weed burner over the whole thing to try and clean it up, so I want the garden dirt bare.
There are two kinds of people: Those who can extrapolate from incomplete data.
It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring - Carl Sagan
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The main benefit to fall tillage is that in the spring the soil will warm up faster and be ready for seeding earlier. That applies to black loam soil more so than other types. The soil would dry quicker in the spring also, and again would get you a nice headstart especially in a wet spring. Also by tilling in the crop waste it starts decomposition of the organic material faster, so it would be available as nutrients the next year.