Are you planting into ground that you took a crop off of..?? And what are you wanting to sow..?? I sowed Oats on my small potato patch last year in Sept., intending to get 8"-10" tall cover crop, then get a winter kill. I disked it up with a pretty aggressive cut on the disk, Sowed the Oats with a pull larger pull type broadcast spreader, then set the disk to a light cut, to cover it up. Worked very well. We had a warm late Fall, and Oats got to the boot stage, before it finally got cold enough to kill it. I had to mow it this Spring to chop it up, before plowing down. Love the fact you don't get a heavy root mass like with cereal rye to deal with when cultivating, at least in a garden.
For over seeding/inter-seeding in established pastures, I use 2 methods. I bought a small 4' slit seeder that was used by a local high school to over seed their football field When they went to Astro-Turf, they had no use for it. Got it at a surplus sale for $100, it's not pretty, but works great for sowing grasses, clover, timothy, etc. Although it's only 4' wide, suggested planting speed is around 6 mph. It has a PTO driven cutter that makes approx. 1/4" slits through sod, a ground driven seed box with drop tubes, and curved disks to cover it up. I usually do a Fall planting with it here in Ohio, to get crops started before winter.
I have a 3rd option I can use here, but probably not suitable in southern states. Frost seeding works well here in late winter/very early Spring. Simply broadcast seed, especially clovers when in the early Spring the ground honeycombs during freeze/thaw cycles. You're basically mimicking Mother Nature, dropping seeds on the surface, and the honeycombing of the dirt lets the seed in holes, then covers when it thaws. Works great if you have the weather to do it.
If you're determined to go the drill method, and are planting finer seeds, then a slit seeder would work well for you. But, I don't believe the slots in the seeder will let larger seeds like oats or cereal rye, and definitely any larger seeds through. Mine is a Toro, and used mainly for golf courses, and athletic fields, or doing lawns. And, you don't have to wait until the wind lays to sow, like with broadcast seeding.
Below is prepping to sow oats, and the stand I got. Using the EZ Spreader for frost seeding, and the Toro slit seeder I used, to inter-seed into my hayfield last Sept.