I've had lots of luck with corn, sunflowers, black eyed peas, butternut squash, and watermelon in the summer. Depending on where you are in Alabama, I would definitely plant a winter garden with collards and turnips. Also fence the garden in and inbetween crops let your chickens do the weeding. My gardens are adjacent to the chicken runs and I just fence the birds out when the plants are growing. After the corn and sunflowers are at least waist high you can let the birds run in and they'll do much of the weeding. You'll loose some plants, but not too bad. Keep the chickens away from the squash, peas and watermelons until you've gotten your crop for yourself. After the corn, squash, and sunflowers were done, let all the birds eat everything and deweed the area. I then planted the whole area in black eyed peas. After a month or two I let the chickens in and the plants kinda lasted until frost. I"ve heard and read some warnings about chickens eating raw peas, but it didn't bother mine and they ate the leaves as well. Try to plant the collards, turnips, and other greens in sept and keep the chickens out. Mine love collards and if you plant enough you should be able to give them something green all winter. The mustard greens did well for me also, but the chickens weren't as fond of them. I don't use weed killers on my lawn, and if it is growing especially well they get the clippings. I also don't live in a manicured neighborhood, so in the winter and spring I let hairy vetch grow in most of my "lawn" I'll pull that out and the chickens love it. I just make sure to let enough go to seed in the spring so that it comes up in the winter on its own. When I do actually weed, they get all of that too. If its organic and we aren't going to eat it, it goes in the chicken run. They know best what to eat and not eat.
rich