Thanks guys.
There are no animals down here, nearby. The area is in a flood plain. The crops grown are strawberry, soybean, sweet potato, corn and cotton.
Yes Robert, it seems that some of the top layer of sand becoming silt ( dark brown ). But far from becoming clay. When I dig a foot or more there is yellow sand.
I figure if they can grow strawberry, soybean, sweet potato, corn and cotton , I can grow tomatoes, peppers, okra and few other thing.
Look at the picture below. Amazingly the grass is doing well.
one
nc-gar 2.jpg
two
nc-gar 4.jpg
I have done a non-scientific soil profile check on the garden soil. I will take a picture and post it later/