When/if you plant them in the ground the soil acts as a buffer so you dont have to worry to much about ph but save yourself some $$ and get a soil testing kit a lot cheaper than a ph pen.
Plus there are usually a lot of good nutrients in the soil already if its good soil of course! so the only nutes you will really need is some potash to spread around the bottom of your plants when they start to crest.
Bonemeal is also cheap organic and a good source of N and if you can get some get some rock bat guano which is high in K.
hope this has helped you.