Not sure roundup would be the best choice Agri vinegar would not affect any potential crops. Especially if they are in an area that does not allow using roundup.If you are going to put in a food plot, you need to spray the area with Roundup or some other weed/grass killer and let it sit for a week or so before trying to till it or you will have a new weed bed and the time and money you've spent on seed and fertilizer for your food plot will be wasted. You won't be able to till the weeds out of it.
I've been around over five decades. We have a LONG tiller that's been here as long as I can remember. In good shape. But we ALWAYS cut vegetation off and cut again close. Rake it out of the area. I even lawn mower it. Then disc or loosen up somehow. Once tilled it can be tilled each year or so. But be careful the initial time. Grass and weed roots hold soil together. Go slow in low low. Beauty of a tiller is that it shreds the root system. Also we have a 1200 gal propane tank made into a roller, which works good with the tiller. Fill it with water from the pond. Makes it easier to drive on and plant with a planter. We grow food plots for people though.So my cutter still hasn’t come in yet and we have a lot of raining coming which is perfect for a fall food plot. Would it be ok on my tiller to till up a spot that has waist high grass/briars? I’d rather wait if it will cause a problem with the tiller and just assume to not have one at all if it comes down it. But if it’s not gonna hurt it I want to use it.