Not really. I had a field last year that I fed hay in and planted to soybeans the following year. You could see where each ring was in the beans, they were a little taller and held onto a few leaves longer, but they cut easy enough. I'm a no tiller, but have to work up the places where hay is fed, to rough. The unrolling thing makes sense to me, but haven't had a good way to do it, but this little experiment shows me all I need to know, that's a very noticeable difference in fertility. I have to get on the stick and get my unroller built this winter.
I'm also going to do some cover crop strips to see if there's a noticeable difference in the beans. Side by side is the best way to compare IMHO.
No doubt the covers will help, just want to see the difference it will make. I'll graze the covers as well.