. Modern Chemistry formulations are leaning to lower Gallons per Thousand applications. However I am Old School and Like 5 G/K when doing Liquid fert. My lawns are mostly St Augustine and have a heavy thatch. Plus I have a lot of chinch bug pressure. Therefore I want to fire hose the yard. Most others in my area are doing 2 to 3 G/K so they can get more yards out of the same size sprayer. Most all Pesticide Labels will give the recommend carrier rate. You need to pay attention to those rate when adding them to a Fert & Squirt tank. When applying a liquid fertilizer, the more carrier the more even the distribution. The truth is 5 G/K is a lot more forgiving than 0.5 G/K. You can either Stripe or burn a lawn a lot easier with Higher % A.I. than a lower. .