Hi all-- I'm new to the large-scale liquid application of fertilizers/herbicides. For example, I understand that when using a large skid-type tank setup in the back of a pickup, you mix the product being applied into the tank at a set amount...say 2 oz. per acre for instance. Then you decide you'd like to apply that chemical via 3 gallons of water per acre. But when just using a hand-held spray wand, how do you apply the product evenly?! I understand that if using a boom-type sprayer, you can calculate the GPM flow of the nozzles, take into account the speed of the vehicle pulling the sprayer, and then use those numbers to figure the amount of chemical being applied per acre. But how do you maintain equal and correct coverage when using a hand wand? I know this is a real beginner question, but that's what I am!