air pruning pots and fabric work great i use them for really small fruit trees until there big anough to go in the ground but i keep them in there for close to a year the root look great when i transplant them no circling and they explode when going in the ground
The books are free to download. They have lots of pictures of setting up a air pruning nursery. Basically, they make a "table" with legs of sticks/bamboo, and the table surface of straw and sticks. Then put a 6inch tall "walls"/frame around the edge of the table surface, and then fill that with soil. The pictures really explain it better than words do!