Second the recommendation to check out any past herbicide uses.
You also don’t list your location. In my area, this time of the year, the ground is usually too hard to work, so everything would be put off until spring. By some grace of god, the ground is actually not yet frozen, so some of these steps could be done now.
But my general plan would be:
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Leave it all as-is for now. The roots of the corn and cover crop will hold everything in place over the winter.
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Plow everything far under in the spring, once the ground is unfrozen.
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Harrow, to smooth everything out.
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Plant your grass seed, and let it sit for the rest of the year. Tread lightly around the edges to get your fencing up. You can MAYBE let the horses onto it for the late fall, and you MAY need to mow it once or twice. It will definitely vary on the year, the grass, and the location.
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Horses can go out on it over the winter, once there’s some snow cover.
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Can start using it as pasture the following year.
You definitely won’t have grazing land in 2015, not if you’re going to do it right with perennial grasses.
It’s also going to be a ton of work if you don’t have the proper equipment.
A warning about those corn stalks…be careful riding/walking in them. They are at the perfect angle to stab into your calf/your horse’s leg, and they are SHARP. I have a big scar on my calf from running through them as a child, went right up the side of my leg and took off a huge strip of skin. Disgusting. :blech: