Get Your Chemical Label

The spray tip selection tools found on this page will only help you if you have the chemical label. Find your label by CLICKING HERE. Please do not continue without.

Always adhere to the precise directions printed on the chemical label you are applying. The chemical label will help you determine the recommended droplet size, application rates, sprayer speed, and nozzle spacing for your specific application. If you cannot find the chemical label in this database, we suggest you consult your local agronomist.

The Four Things You Must Know

Droplet Size Image

1. Droplet Size

Application Rate Image

2. Application Rate

Sprayer Speed Image

3. Sprayer Speed

Nozzle Spacing Image

4. Nozzle Spacing

More Help: Terms & Definitions

Droplet Size / Spray Quality

The size and variation of droplets produced by a spray tip. This is the critical performance characteristic for selecting a spray tip that is suited to a particular application. There are several classification systems in use. The one used in this calculator is the American Society of Agricultural and Biological Engineers (ASABE) S572 standard. It defines several droplet classification categories, six of which are useful for agriculture and horticulture (Very Fine, Fine, Medium, Coarse, Very Coarse, and Extremely Coarse).

  • Very Fine sprays are less commonly used because such small droplets are prone to drift unless they are used under special weather conditions or with spray equipment designed for them.
  • Fine and Medium are often used for foliar-acting weed control and contact-acting fungicides and insecticides.
  • Medium sprays are also often used for systemic-acting fungicides, insecticides and herbicides. Medium sprays are used by default by most applicators when spray quality is not defined by the label.
  • Coarse and Very Coarse sprays are often used for systemic and residual herbicides.
  • Extremely Coarse sprays are often used for soil-applied herbicides and fertilizers.
Measurement Units

US Gallons per Acre – the units of measure for “application rate” common in the United States and some areas of Canada and Mexico. Selecting this as your unit of measure will set the calculator to ask for inputs in US units.

Application Rate

The volume of finished spray applied per treated area (US: US gallons per acre, Metric: liters per hectare). Follow the instructions on the pesticide label to determine an appropriate spray application rate. If a range of application rates are listed, use the rate that matches your situation or consult an agronomist.

High application rates provide more spray per area and can increase spray coverage of the target but require more frequent stopping to refill the sprayer, reducing the area that can be treated in a day. Lower application rates require fewer stops for refilling but require close management of spray quality to maintain adequate coverage of the target.

Sprayer Speed

The forward speed of the spraying equipment. Speed sensors should be calibrated or checked for accuracy regularly. Speed can be checked by timing how long it takes to travel a measured distance:

MPH = feet x 0.682 ÷ seconds

Tip Spacing

The distance between tips on a broadcast spray boom.

Solution Density

The weight (US) or mass (metric) of the spray solution per unit volume (US: lbs/gal, metric: kg/L). High density liquids like some fertilizers pass through nozzle orifices more difficultly than plain water and low density liquids. This must be considered when determining the spraying pressure needed for a spray tip.

First Things First…Get Your Chemical Label

You should always adhere to the precise directions printed on the chemical label you are applying. Additionally, the chemical label will help you determine the recommended droplet size, application rates, sprayer speed, and nozzle spacing for your specific application. If you don’t have the chemical label with you, click the icon to search for the chemical you will be spraying. If you cannot find the chemical label in this database, we suggest you consult your local agronomist. The spray tip selection tools found on this page will only help you if you have the chemical label.

The Four (4) Things You Need to Know

Droplet Size Image

Droplet Size

Application Rate Image

Application Rate

Sprayer Speed Image

Sprayer Speed

Nozzle Spacing Image

Nozzle Spacing

TeeJet Spray Tip Selection Tools

Hypro Spray Tip Selection Tools

Additional Help: Terms & Definitions

Droplet Size / Spray Quality

The size and variation of droplets produced by a spray tip. This is the critical performance characteristic for selecting a spray tip that is suited to a particular application. There are several classification systems in use. The one used in this calculator is the American Society of Agricultural and Biological Engineers (ASABE) S572 standard. It defines several droplet classification categories, six of which are useful for agriculture and horticulture (Very Fine, Fine, Medium, Coarse, Very Coarse, and Extremely Coarse).

  • Very Fine sprays are less commonly used because such small droplets are prone to drift unless they are used under special weather conditions or with spray equipment designed for them.
  • Fine and Medium are often used for foliar-acting weed control and contact-acting fungicides and insecticides.
  • Medium sprays are also often used for systemic-acting fungicides, insecticides and herbicides. Medium sprays are used by default by most applicators when spray quality is not defined by the label.
  • Coarse and Very Coarse sprays are often used for systemic and residual herbicides.
  • Extremely Coarse sprays are often used for soil-applied herbicides and fertilizers.
Measurement Units

US Gallons per Acre – the units of measure for “application rate” common in the United States and some areas of Canada and Mexico. Selecting this as your unit of measure will set the calculator to ask for inputs in US units.

Application Rate

The volume of finished spray applied per treated area (US: US gallons per acre, Metric: liters per hectare). Follow the instructions on the pesticide label to determine an appropriate spray application rate. If a range of application rates are listed, use the rate that matches your situation or consult an agronomist.

High application rates provide more spray per area and can increase spray coverage of the target but require more frequent stopping to refill the sprayer, reducing the area that can be treated in a day. Lower application rates require fewer stops for refilling but require close management of spray quality to maintain adequate coverage of the target.

Sprayer Speed

The forward speed of the spraying equipment. Speed sensors should be calibrated or checked for accuracy regularly. Speed can be checked by timing how long it takes to travel a measured distance:

MPH = feet x 0.682 ÷ seconds

Tip Spacing

The distance between tips on a broadcast spray boom.

Solution Density

The weight (US) or mass (metric) of the spray solution per unit volume (US: lbs/gal, metric: kg/L). High density liquids like some fertilizers pass through nozzle orifices more difficultly than plain water and low density liquids. This must be considered when determining the spraying pressure needed for a spray tip.