Make the most efficient use of your chickens and garden. The chickens scratch up (aerate) and poop all over the soil (fertilize) in one yard while a garden in the adjacent yard makes use of the chicken's efforts from the previous season. Of course, the chickens have no access to the garden until it's done being harvested.

After harvesting, move the chickens to the other yard to take care of the plant remnants, adding sticks and other mulch for the chickens to tear up helping add even more organic matter to the soil.

An example design: