Look at Fertilizer in the forum Wiki (header at top of forum) for info. Also, there is much discussions about fertilizer, use the search function to find the Treads. This is a link to one;
Fertilizer
IMO, a general fertilizer such as 10-10-10 about 10lb for the year and a supplement of potassium sulfate ( about 1 - 1.5 lbs) should be enough. You need the plant to flower about July to harvest fruit before frost in your area.