That's frustrating, isn't it? I'm finding in gardening that organic matter is the answer to everything. Do you compost your chicken and horse manures? You should be able to build up that soil nicely with things like that. Unless you have piles of your own ready made compost it does sound like your best bet is containers for this year. But if work on that soil you should have a decent garden by next spring. I've also found that it is important to get the garden ready by the fall so the rains can soak it in. Then mulch it good with leaves/straw/cardboard-stuff that you have so that the worms can do lots of work in it all winter for you.