Help me to understand the application rate. If a soil test indicates a need for 45 pounds of N, 30 pounds of P and 15 pounds of K, that would require 300 pounds per acre of a 15-10-5 liquid fertilizer. Normally fertilizer analysis of 15-10-5 would indicate that the liquid purchased is 15% nitrogen by weight, 10% P by weight and 5% K by weight. The website states that a normal application is 32 oz per acre which cost $15/acre for the product.
Product is 11 pounds per gallon which is 2.75 #/quart. That would require 109 applications to get the required 45 pounds of N, 30 pounds of P, and 15 pounds of K. I must be missing something.