In the ornamental industry, the desired yield is often healthy plants that produce abundant flowers marigolds, Impatiens, etc. In the food side of the agriculture industry the desired yield is often the fruit produced tomatoes, apples, beans, etc. With oaks, our desired outcome is much like the agronomic producer increased fruit production. Fertilization can help in both areas and does this primarily by increasing plant health and vigor. There are several factors that affect acorn production.
Age is one factor.
Our native oaks do not typically produce acorn crops of any magnitude until they are at least 25 years or older. There are occasional exceptions, but across the board this is usually a minimum age for significant acorn production. You cannot change this characteristic, and fertilizing young native oaks will not stimulate them to produce acorns before their constitution allows. What it can do, under the right circumstances, is help the tree develop into a vigorous, dominant oak capable of producing significant acorn crops when it matures to acorn-producing age. When identifying candidates to fertilize, make sure they are of age to offer acorn production.