DICKEY-john Corporation | Agricultural, Analytical, & Public Works Electronics

Sprayer Tips

Select quality nozzles that will resist wear.
The gpm flow rate of a nozzle is directly correlated to pressure and can be calculated once a known flow rate at a certain pressure is measured. As nozzles begin to wear, this flow rate will increase with a direct impact on application rate per acre.

Check the spray nozzles a couple times per year to ensure all nozzles are within original specifications.
A catch test is quick and easy to do by initiating a liquid pressure on the spray boom and catching the flow from each nozzle for a period of time. A nozzle that has a gpm flow that differs 5% from the average across the boom should be replaced.

Choose the right spray tip for the job.
Consider the type of nozzle (spray pattern) and size of nozzle (provide the output of material within the desired pressure).

Select the correct application rate of the chemical being used.
This is usually recommended on the chemical label and defined in gallons per acre.

Scout the fields to be sprayed for weed control to determine the rate of chemical that should be applied to effectively kill the desired weeds.
Under-application of chemical on large weeds will not result in the desired control and increase cost when a second spraying is required.

Utilize a ground speed control system for spraying chemicals.
Ground speed controls increase and decrease the spray pressure in sync with changes in ground speed to maintain a uniform application rate per acre. This results in better weed control and reduces cost associated with over application.

Use the Liquid Spraying Calculator to select the correct size liquid pump and control valve required for the size of sprayer and vehicle speed used when applying material in the field.

Use a ground speed control system for the application of liquid materials.
Control systems maintain a desired target application rate as ground speed of the vehicle changes. When these systems have been set up and calibrated properly they will maintain a 2% accuracy of application per acre. The graph below demonstrates the inaccuracy of application when a ground speed control is not utilized with the only variable being changes in vehicle speed.

dickey john sprayer control versus no control chart

DICKEY-john offers a number of products to improve the efficiency of your spraying: