yes, I can imagine your garden!! I lived in arkansas for a while many years ago (not for very long, went for a holiday and stayed!!) the ground there was not very good, mostly dirt and no substance.
my ex g/f who I was visiting wanted to make her garden better so we spent a lot of time on it using plenty of this www.choiceful.com/choiceful-id-18248-Phostrogen-Swell-Gell-Pouch-250g.html
well the US version of it anyway!!
we found that the more compost we used, the more the wild animals liked digging around, uprooting things and generally eating the new earth which I thought was odd, but what we did was to remove the top 6 inches of soil, place the compost down and then add the soil back without mixing it with the compost which did deter many from digging up.
not sure if you will still them over there but we also came across a good decvice. it had a PIR sensor and when triggered, instead of releasing a high pitched noise like they do in the UK to scar off cats, it sent out a ''rattle'' just like the snake and this deterred many more animals from coming anywhere near!!
one of the studies I had to do for my first degree was on the effects of water extraction and usage withintexas and its effects on the ''great aquifer''. the results were quite astonishing on how texas and the area covered by the aquifer were drying out at an alarming rate and the difference from even just 50 years ago is amazing, but then I am teaching granny to suck eggs with this story aint I!!
my old gardener friend always says grow what the soil allows you to grow and nowt else (lad!!)
have you thought about growing cacti for food?
www.foodreference.com/html/art-cactus.html]]
www.botanical-online.com/familiacactaceasangles.htm
www.voanews.com/english/archive/2006-03/2006-03-22-voa17.cfm?CFID=48006679&CFTOKEN=30227433
I just googled ''cacti as food'' and had hundreds of sites come up. worth a thought if not already had it, never know, may be the start of a whole new line of work, supplying the mexican restuarant market????
hmm, think I may do my son a mexican meal tonight, haven't had one in a while