# Sprayer Calibration

March 28, 2014 02:54 AM

By: Gary Bates, Director of the University of Tennessee Beef and Forage Center

Before you can accurately apply the right amount of herbicide to a field, you have to know how much volume the sprayer is applying to each acre. Sprayer calibration is not difficult, but it can be challenging if you have never seen it done before. Here are two simple methods of spraying calibration:

Spray and acre method: In this method, you fill the tank with water, spray an acre, then see how much water it takes to refill the tank. Pretty simple, but takes a little time. You also have to be exact on the land area measurement.

1/128th method: this is a relatively fast and accurate method.

1. Select a course length based on nozzle spacing (from chart below)

2. Measure out course in field to be sprayed.
3. Measure time to drive course. Use a comfortable gear and speed. Take the
average of three trips.
4. Park tractor and catch the ouput from one nozzle for the time found in step 3.
5. Measure in ounces. This will equal the gallons per acre output.

Example: You have a pasture that is 5.4 acres large. You would like to spray 1.6 pints of GrazonNext HL per acre. How much herbicide do you need to add in each tank? You have a sprayer that holds 100 gallons with nozzles spaced 20 inches apart.

• You need to measure a course 204 feet in length.
• You drive it three times and average 46 seconds to drive the 204 feet.
• You park the tractor and catch the spray from one nozzle for 46 seconds. Measures 18.5 ounces. You are applying 18.5 gallons per acre.
• The sprayer holds 100 gallons, so 100 gallons ÷ 18.5 gal/acre = 5.4 acres can be covered with each tank.
• 1.6 pints per acre GrazonNext x 5.4 acres =
• 8.6 pints GrazonNext needs to be added to each tank.

Back to news

No comments have been posted to this News Article

## A Quiet Killer Lurks in Rural America

By Ben Potter
•  GMO Labeling Bill Signed Into Law 07/29/2016 05:14 PM
•  Corn and Soybeans Stall 07/29/2016 01:49 PM
•  Beef Export Bonanza for Brazil as Chinese Eat More Foreign Steak 07/29/2016 01:26 PM
•  Potash-Supplier Group Will Only Sign China Contracts for 2016 07/29/2016 01:04 PM
•  These 20 Factors Could Shift Your Land's Value 07/29/2016 11:30 AM
•  Organic Farmer Seeks \$210,000 After Cows Defecate on Crops 07/29/2016 10:33 AM
•  Europe's Top Wheat Grower May Import After Worst Crop in Decade 07/29/2016 07:57 AM

## Corn College TV Education Series

Get nearly 8 hours of educational video with Farm Journal's top agronomists. Produced in the field and neatly organized by topic, from spring prep to post-harvest. Order now!

## Markets

Market Data provided by Barchart.com
 Cash Bids
 LDP Quotes
 ©2016 Farm Journal, Inc. All Rights One Penn Square West 30 S. 15th Street, Suite 900 Philadelphia, PA 19102
Close