New here too. I used tillage radishes along with legumes as a fall cover crop when I was converting a couple of acres of former dryland farm ground back to native grasses when I bought my place three years ago. I'd just broadcast seed with no tillage in September on the high plains. I imagine the birds ate quite a bit of the seed but you can find it in bulk at reasonable rates.

They survive on pretty little moisture -- my locale average slightly over an inch/month for Sept/Oct before the temperature is sufficiently cold to winter kill them. I only ate a few and left the rest to winter kill and decompose over the winter. Make nice little empty pockets for the spring moisture to sink into the ground like a natural aerator.