I am growing maize successfully in the p/tunnel for us humans and the stalks go to the goats. However I wanted to try and grow a few more for them (doesn't matter if they don't set cobs, as goats love the greenery) and I don't have enough space in the tunnel. Have a couple of spare beds outside (Scot Borders), so was trying to combine a low-growing green manure with a top crop...
I have grown Hungarian rye grass in the past as a green manure and it was difficult to dig it in/get rid after growing. The alfalfa or clover would stay in a for a couple of years at least.
Maybe I try some normal grains.... I am just thinking about the possibilities...