KSU-OF1) but produced by 2 different trees. The large nuts were produced by a tree nearly 12 inches in diameter while the 2 smaller nuts represent the 1st crop produced by a tree 2.5 inches in diameter.
The explanation for this common occurrence is simple. As a pecan tree grows, it becomes more and more of a dominate force in its environment. Larger trees are just better at competing with the ground cover for water than younger trees. More water means bigger and normally sized nuts. So don't be discouraged by small nuts on young trees, the time will come when a larger tree will be covered with large beautiful nuts.