If this is for a lawn, I would not worry about it. Grass can grow just fine at that pH level. If you decide to go through with it, this is not something that can be done over night without amending your soil. I'd figure out how much each zone covers, and add the proper amount for that square foot and run the zone until the tank is empty. If you use something like Ammonium sulfate that takes about 5 lbs to get 1 lb of n per 1000 sq/ft, you might want to set the tank on the fastest setting so you are not flooding your lawn with extra water, and having most of it run off.

Michael