After my field was cleared I broadcasted winter rye. The turkeys loved it! They started on one end of my field and over the course of a week or more, stripped it clean. Every night I would go up and see the line where they had stopped.
The following year I tried oats. That was a waste of time and money. So I bought buckwheat... that came up but was short and anemic.
For my vegetable garden I bought manure or compost every year, and would put some with every plant. I also planted lots of beans, mostly to turn them under. Last year I started digging into the stump piles, which contained the top layer of topsoil. After 12 years the stumps have mostly rotted down, so hopefully I'm adding organic matter back into the garden.