You can reduce the application error below 5 percent by trial and error. However, to save time, use the following equations to determine the new travel speed and the pressure required to increase the flow rate from 1.06 to 1.25 gal. To correct your application error, either reduce your travel speed from 5 mph to 4.24 mph, or increase the sprayer operating pressure from 30 psi to 41.7 psi. Effective pest control is more than getting the right amount of chemicals on the ground. Make sure all nozzle tips are properly aligned.
Some nozzles require overlapping adjacent spray patterns.
Check the nozzle catalog to determine the overlap required for a given type of nozzle, and adjust the boom height accordingly. There are some simple and practical ways to examine the spray pattern of the sprayer boom. Special portable spray patternator tables can be used to see the uniformity of spray distribution. If a spray table is not available, add non-staining colorant to the spray mixture and spray over a test area. You should see the color on the ground the same from one end of the boom to the other.