Toquerville soil contains clay and sand but is excellent soil if composted material is added. My experience is that fall leaves tilled in with plentiful horse manure in the fall, makes a wonderful composted soil in the spring. In the warmer climates, this compost can be tilled three or four times during the winter and be ready for spring planting. In colder climates, the leaves and manure can be tilled in late fall and again in early spring, and are then ready for planting.
In Washington County, the fair grounds offers composted horse manure and sawdust for ten dollars a pickup load. This is excellent material and can be tilled in the soil at anytime.
I have also successfully used straw and steer manure, although it takes a little longer to break down.