Look for greens grade fertilizers. Usually they are high potassium and lower nitrogen. Be prepared to pay up to $60 a bag. This is why I spray everything. One bag of potassium nitrate will cover up to an acre of lawn. The low analysis fertilizers will need up to 5 bags per acre.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738