Don from Thorndale Texas writes
Triple 10 (10-10-10) and Hay Maker (18-3-4) products compute to 22 to 29 gallons needed for my 4 acres, but this (7-9-5) computes to only 2 gallons needed for same acreage. Seems like a very small amount. Using your light rate of 1 qt per 20 gal water per acre requires only 4 qts of fertilizer. Using your heavy rate of 2 qts per 10 gal water per acre requires 8 qts of fertilizer. I don't understand the significant differences between these products quantities for a 4 acre coverage.