questions and concerns about growing my own feed

I pasture my chickens in 2 separate areas, as well as a run I have for them. The pasture areas I use are 90X100. One is the goat pen and one is my garden. They can go in the garden to clean up for me. I feel that way saves me on the feed, but I am wanting a 3rd pasture area for the winter and when they wipe it all out, plant some grain that I can use as their feed, hopefully for the year. I am thinking I could grow and harvest that, while they are cleaning up for me and in the goat pen and let them back in after I pick up the grain.
I was figuring on corn and either soy or cowpeas, growing up on the corn. My problem is that my husband doesn't think I will get enough grain for it to be worth my effort. The area will be roughly half the size of my pens, so I am looking at about 45X50 ft. There is one big cypress tree that will block some sun, but for the most part all of this area will get at least a 8 to 10 hours of direct and indirect sunlight.
Now I have at present 61 chickens, all total, but like I said, I pasture them, and give them table scraps, so I don't rely on grain alone.
Now for those of you that grow your own grain, do you think I can grow enough corn and peas or beans to make a marked difference in my feed? How many LBs would you feel I can produce with that amount of space. I am very good with growing things and so is my husband, but I only did it for the family and not for the animals.

 

Shut up only works for me. For him it has to be more me tricking him. I'll figure something. I mean if its not worth it for me, then why is it worth it for anyone? Somewhere in existance is a farm that produces my cracked corn. Do I have to understand that my chickens need 40 acres of a farm several states away and the same for all of you? I come from farming people and I used to get down on my little hands and knees to help the family dig the potatoes every year and I go on small scale farming. With all the unused yard I have, there has to be a way for me to tap into it so I can have more of my egg and meat money/savings than the feed store. Even if I just let them wipe an area out and then follow it with cowpeas....that would be high in protein and would improve the soil.