Is that a liquid? If so, you will spend a lot of money to raise the K on 30,000 square feet. I would recommend looking for a source of sulfate of Potash (0-0-50). A single application is usually 1 lb/1000 square feet of K (2 lbs/1000 square feet of 0-0-50). For your 30k square feet, you would been 60 lbs of product. I would probably just buy a 50 lb bag and call it close enough for a single application. I don't know how many applications you need, but the soil test should tell you.
Bluegrass in the Transition Zone
Front: After Midnight
Back: Solar Eclipse, Bewitched (in shade)