Can anyone tell me what type and when white oaks should be Fertilized?

I fertilize in the spring (March - May). 5-10-15 is what I would suggest, but if you can't find it 10-10-10 will work. BioLogic had Tree Fertilizer Paks on close out. www.plantbiologic.com click on Bargain Bin.
They are only $3.50 for 32 = 1 ounce packets. That's as good of a deal as you'll find.

I release the tree and take down all the competition for at least a few feet beyond the drip-line and then walk the drip-line and toss out the fert-packs. The packs are biodegradable.