Here are three choices that work well: a handful of Triple 10 scattered around the bases spring and fall; 18-18-8 at the base, Jobes tree spikes for evergreens.
Actually pine trees usually do not need to be fertilized. It can actually can hurt the pine, however, if your tree shows brown or yellow needles and is growing slow, fertilizer can bring it back to health. They type of fertilizer you will need is an acid soil fertilizer. Cover the fertilizer with pine needles when you are done.
In order to fertilize your pines, the best bet is to buy some at a local greenhouse or garden supply store. The best pine fertilizer will have at least 27% nitrogen content in order to push the most growth. Truthfully, it will also depend on your specific species of pine.
A soil test will indicate nutrient deficiencies and PH. Choose a fertilizer made for acid loving conifers if your soil is on the neutral to alkaline side. If the soil is already acidic, any fertilizer for evergreen conifers will suffice. Most pines rarely require fertilizer.
Make sure that you use a fertilizer formulated for evergreens. Either use a granular fertilizer at the base and water it in or pound fertilizer stakes at regular intervals around the drip line of the pine. That will give your pine a good, extended feed.